The central pathway, also known as the dorsal stream or "where" pathway, is considered a specialized cognitive sequence because it is involved in processing spatial information and guiding visually-guided movements.
This pathway is responsible for extracting information about the location, motion, and spatial relationships of objects in the environment, and uses this information to guide actions such as reaching and grasping. The specialization of the central pathway is due to the unique set of neurons and neural connections that make up this pathway. These neurons are concentrated in the posterior parietal cortex and other brain areas involved in spatial processing, and are specifically tuned to respond to visual information related to spatial relationships and motion.
Overall, the central pathway is an important part of the visual system that allows us to interact with our environment and navigate through space. Its specialization reflects the importance of spatial processing and visually-guided movement in many aspects of human behavior and cognition.
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Surfactant is produced by what cell type in the alveolus?
Surfactant is produced by specialized cells called Type II alveolar cells, also known as surfactant-producing cells.
These cells are responsible for synthesizing and secreting the surfactant, which helps to reduce surface tension in the alveoli and prevent their collapse during expiration. Surfactant is produced by a specific cell type in the alveolus called Type II alveolar cells, also known as Type II pneumocytes. These cells synthesize, store, and secrete surfactant, which plays a crucial role in reducing surface tension within the alveoli and preventing their collapse during exhalation.
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Which of these secondary lymphatic structures have a complete capsule? lymph node/tonsils/lymphatic nodules/MALT/spleen
Both lymph nodes and the spleen have a complete capsule.
Lymph nodes are bean-shaped structures that filter lymph fluid and house immune cells. A fibrous capsule surrounds each lymph node, enclosing the entire structure.
The spleen is the largest secondary lymphoid organ and is responsible for blood filtering and the removal of old or damaged red blood cells. It also has immune cells and a white pulp that aids in immunological function. The spleen is fully surrounded by a capsule made of connective tissue.
Tonsils, lymphatic nodules, and MALT are all kinds of lymphoid tissue that are found throughout the body and play a role in immune function, although they lack a full capsule.
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What happens if MPF (mitosis-promoting factor) is introduced into immature frog oocytes that are arrested in G2?What happens if MPF (mitosis-promoting factor) is introduced into immature frog oocytes that are arrested in G2?Nothing happens.The cells enter mitosis.The cells undergo meiosis.Cell differentiation is triggered.
If MPF (mitosis-promoting factor) is introduced into immature frog oocytes that are arrested in G2, the cells enter mitosis. Option B is correct.
MPF is a complex of two proteins, cyclin and cyclin-dependent kinase, that is responsible for initiating mitosis. In immature frog oocytes, MPF is present in low levels and is inhibited by another protein called maturation promoting factor (MPF), which keeps the oocyte arrested in G2.
When MPF is introduced into these oocytes, it overwhelms the inhibitory effects of maturation promoting factor and triggers the cell to enter into mitosis. This is because MPF initiates a series of events that ultimately lead to the dissolution of the nuclear envelope and the condensation of chromosomes, which are characteristic of mitosis.
This experiment has been a classic method to study the role of MPF in the control of the cell cycle, and has contributed significantly to our understanding of the molecular mechanisms that regulate cell division. Option B is correct.
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Explain how the experiments you performed demonstrated the principle of osmosis?
These experiments demonstrate the principle of osmosis by showing how water molecules move across a selectively permeable membrane in response to differences in solute concentration on either side of the membrane.
Osmosis is the movement of water molecules across a selectively permeable membrane from an area of high water concentration (low solute concentration) to an area of low water concentration (high solute concentration). In the experiments we performed, we used a selectively permeable membrane in the form of a potato slice. We placed the potato slice in different solutions of varying concentrations of salt or sugar. In the first experiment, we placed the potato slice in distilled water. Since the concentration of solutes in the potato is higher than the concentration of solutes in the water, water molecules move from an area of high concentration (water) to an area of low concentration (potato), resulting in the potato slice absorbing water and swelling in size. This is an example of osmosis in action.
In the second experiment, we placed the potato slice in a solution of saltwater. Since the concentration of solutes in the saltwater is higher than the concentration of solutes in the potato, water molecules move from an area of high concentration (potato) to an area of low concentration (saltwater), resulting in the potato slice losing water and shrinking in size. This is another example of osmosis in action, but in the opposite direction.
Overall, these experiments demonstrate the principle of osmosis by showing how water molecules move across a selectively permeable membrane in response to differences in solute concentration on either side of the membrane.
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Which cell process is best modeled by the diagram above?
facilitated diffusion
passive transport
exocytosis
osmosis
Answer:
osmosis
Explanation:
trust me i know it
answer d osmosis
explanation
The language of mRNA is often described as a "triplet code". Explain the significance of this reference.
The language of mRNA is referred to as a "triplet code" because each nucleotide in the mRNA molecule codes for a specific amino acid, and the code is read in groups of three nucleotides called codons.
These codons determine the sequence of amino acids in a protein chain during the process of protein synthesis.
Since there are four different nucleotides (A, U, G, C) in mRNA, there are 64 possible codons, but only 20 amino acids are used to make proteins.
Some amino acids are coded by more than one codon, while others have only one codon.
This redundancy in the genetic code is called "degeneracy" and is important because it reduces the risk of harmful mutations.
Additionally, the triplet code is universal, meaning that the same codons code for the same amino acids in all organisms, from bacteria to humans.
Understanding the significance of the triplet code has helped researchers develop gene editing technologies and study genetic diseases.
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Question 18
Concern over increased carbon dioxide levels in the atmosphere revolve around issues of a. human health
b. air pollution
c. plant destruction
d. global temperature
Concerns over increased carbon dioxide levels in the atmosphere primarily revolve around the issue of global temperature. The Correct option is D
Carbon dioxide is a greenhouse gas that traps heat in the atmosphere, contributing to the Earth's natural greenhouse effect. As carbon dioxide levels increase, the Earth's temperature also increases, leading to a variety of impacts, such as melting ice caps, rising sea levels, changes in weather patterns, and more frequent and intense heatwaves, storms, and wildfires.
These impacts can have significant environmental, economic, and social consequences, affecting human health, agriculture, infrastructure, and ecosystems. Therefore, efforts to mitigate and adapt to the effects of climate change by reducing carbon dioxide emissions and promoting sustainable practices are essential for the well-being of both present and future generations.
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Rank the following in order of increasing volume: (a) bacterium, (b) virus, (c) water molecule.
A virus is the smallest of the three and consists of a single molecule or a small number of molecules, making it the least voluminous.
Ranking in order of increasing volume: (b) virus, (c) water molecule, (a) bacterium.
A water molecule is larger than a virus but still small and compact, so it has a slightly larger volume. A bacterium is the largest of the three and consists of multiple molecules, making it the most voluminous.
In order of increasing volume, the ranking would be: (b) virus, (c) water molecule, (a) bacterium.
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All of the following are types of subsistence agriculture except. a. pastoral nomadism
b. truck farming
c. shifting cultivation
d. swidden agriculture
e. intensive rice farming
Truck farming Subsistence agriculture refers to a type of farming in which the farmers produce only enough food to feed their families or small communities. Pastoral nomadism, shifting cultivation, swidden agriculture, and intensive rice farming are all examples of subsistence agriculture, but truck farming is a commercial type of agriculture where crops are grown for sale in markets, rather than for personal consumption.
Commercial agriculture is focused on producing crops or livestock for sale in the market, whereas subsistence agriculture is primarily for the purpose of feeding the farmer and their family. Subsistence agriculture is typically characterized by small-scale, low-input farming methods that are intended to provide food and sustenance for the local community or household, rather than for commercial sale.
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Interaction:Honeybees (1) pollinate daises (2) while feeding on their nectar and pollen.
The interaction between honeybees and daisies is an example of mutualism, a type of symbiotic relationship where both species benefit from their interaction.
In this case, honeybees feed on the nectar and pollen of the daisies, which provides them with a source of energy and nutrients. At the same time, as the bees move from flower to flower, they inadvertently transfer pollen, allowing for the fertilization of the daisies and enabling them to reproduce. This interaction is important not only for the survival of honeybees and daisies but also for the wider ecosystem as many other organisms depend on the daisies as a food source.
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a(n) is composed of four elements: a nitrogen, an acid, a hydrogen, and a side group.
An amino acid is composed of four elements: a nitrogen, an acid, a hydrogen, and a side group.
Amino acid:
An amino acid has a central carbon atom, to which a nitrogen-containing amino group, a carboxyl (acid) group, a hydrogen atom, and a unique side group (also known as an R group) are attached. The side group is what distinguishes different amino acids from each other, and gives each amino acid its unique properties and functions. There are twenty common amino acids found in proteins. Amino acids are the building blocks of proteins and they are linked by peptide bonds to form proteins or polypeptide chains.
Therefore, the answer will be amino acid.
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Net primary productivity is a small fraction (often ~10%) of primary productivity. What happens to all of the energy that is "lost?"
It is not lost, but "invested" in the form of producing offspsring.
It is given off as heat.
It is not lost, but "recycled" in the form of waste products (feces, urine) that are used by other organisms.
It is used to keep the organisms alive (defense, movement, transport of fluids and nutrients, digestion, replacing damaged molecules and cells, sexual display, etc.)
The energy that is "lost" or not used in net primary productivity is used to keep the organisms alive (defense, movement, transport of fluids and nutrients, digestion, replacing damaged molecules and cells, sexual display, etc.) because these functions require energy. option d
These functions require energy to be spent on various physiological and biochemical processes, such as cellular respiration, protein synthesis, muscle contraction, nervous system function, and maintenance of cell and organ structure. The energy that is not used in net primary productivity is thus used to keep the organisms alive and functioning properly.
The energy that is not accounted for in net primary productivity is not lost, but rather utilized in various ways. It is used to keep the organisms alive, through processes like defense, movement, transport of fluids and nutrients, digestion, replacing damaged molecules and cells, and sexual display.
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having the ability to ignore constant stimuli is called ________.
what would happen to carbon levels in the classroom if the pump overheated and burned the microgreens?
Proper ventilation, regular maintenance, and prompt response to any equipment issues are important to ensure adequate indoor air quality and mitigate potential impacts on carbon levels or other air pollutants.
What is Microgreen?
Microgreens are young, edible greens that are harvested when they are at an early stage of growth, typically within 7 to 21 days after germination. They are miniature versions of mature vegetables, herbs, or other plants, and are known for their tender texture, intense flavor, and vibrant colors. Microgreens are often used as a garnish, ingredient in salads, or as a nutritious addition to various dishes.
If the pump overheated and burned the microgreens in a classroom, it would likely result in the release of smoke, soot, and potentially harmful gases, including carbon dioxide (CO2) and carbon monoxide (CO), into the air. This would increase the levels of carbon-containing gases in the classroom, including carbon dioxide.
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the alimentary canal and accessory organs are a(n) the alimentary canal and accessory organs are a(n) organelle organ system tissue cell
The alimentary canal and accessory organs are an organ system. They secrete digestive enzymes and fluids that help to break down food in the small intestine.
What are accessory organs?Accessory organs are organs that aid in the digestion process but are not part of the alimentary canal. The liver, pancreas, and gallbladder are some of these organs. For example, the liver produces bile, which helps to break down fats, while the pancreas secretes pancreatic juice that contains digestive enzymes to further break down proteins, carbohydrates, and fats. Each organ in a system contributes to the overall function of that system, and the systems work together to maintain homeostasis and keep the body functioning properly. When necessary, the gallbladder releases stored bile into the small intestine.
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True or False: The major histocompatibility complex is found in ALL invertebrates.
False: The major histocompatibility complex (MHC) is not found in ALL invertebrates. MHC is primarily a characteristic of vertebrates and plays a crucial role in their immune system.
Invertebrates have other immune defense mechanisms but do not possess the MHC system found in vertebrates. Invertebrates do not possess the major histocompatibility complex (MHC) system found in vertebrates. The MHC is a group of genes that code for cell surface proteins that are involved in antigen presentation and recognition by T cells, which are key components of the adaptive immune system in vertebrates. Invertebrates lack the adaptive immune system and do not have T cells or B cells, which are responsible for the specific recognition and response to pathogens in vertebrates.
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Question 65
The major route of entry of inorganic mercury into humans is through:
a. ingestion of contaminated fish
b. inhalation of mercury vapors
c. ingesting of contaminated vegetables
d. inhalation of pesticide residues
The correct answer to question 65 is a. ingestion of contaminated fish. This is the major route of entry for inorganic mercury into humans, as it can accumulate in fish and other seafood.
Inhalation of mercury vapors and ingestion of contaminated vegetables can also lead to mercury exposure, but ingestion of contaminated fish is the most significant source. Pesticide residues are not a source of inorganic mercury exposure.
The major route of entry of inorganic mercury into humans is through:
a. ingestion of contaminated fish.
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(a) Give these lengths in metres, m, in standard form:
(i) 75 µm (the diameter of a plant cell)
(ii) 750 nm (the diameter of a mitochondrion)
(b) Determine how many orders of magnitude greater a plant cell is than a mitochondrion
:)
A plant cell is two orders of magnitude (or 100 times) greater in size compared to a mitochondrion.
What is Mitochondria?
Mitochondria are small, double-membraned organelles found in the cells of most living organisms, including plants, animals, and humans. They are often referred to as the "powerhouses" of the cell because their main function is to produce energy in the form of adenosine triphosphate (ATP) through a process called cellular respiration. Mitochondria are unique among cellular organelles because they contain their own DNA and have their own ribosomes, suggesting that they have evolved from symbiotic bacteria that were engulfed by an ancestral eukaryotic cell billions of years ago. Mitochondria play a crucial role in cellular energy production, metabolism, and other important cellular processes.
(a) Lengths in standard form:
(i) 75 µm = 7.5 × [tex]10^{-5}[/tex] m
(ii) 750 nm = 7.5 × [tex]10^{-7}[/tex]m
(b) To determine how many orders of magnitude greater a plant cell is than a mitochondrion, we can take the ratio of their sizes in standard form and calculate the logarithm base 10 of that ratio:
Log10(7.5 × [tex]10^{-5}[/tex] / 7.5 × [tex]10^{-7}[/tex]
= Log10([tex]10^{-2}[/tex])
= -2
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____________ did not contain an agricultural hearth. a. Europe
b. Asia
c. Africa
d. South America
e. Middle America
The correct answer is d. South America did not contain an agricultural hearth.
The Andean region of South America is known for the development of advanced agricultural practices, including terrace farming, irrigation systems, and the cultivation of crops such as potatoes, quinoa, and maize. These practices were developed by indigenous peoples over thousands of years and were a key factor in the growth of complex civilizations such as the Inca Empire. The Amazon basin is also considered an important agriculture hearth, as it was home to a range of crops, including manioc, peanuts, and various fruits and vegetables. Indigenous peoples in the region developed sophisticated agroforestry systems, which involved cultivating crops in combination with other trees and plants in the rainforest ecosystem.
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In humans, a gene for free earlobes dominates a gene for attached earlobes. These alternative forms of a gene for earlobe shape are examples of
In humans, a gene for free earlobes dominates a gene for attached earlobes. These alternative forms of a gene for earlobe shape are examples of alleles.
Alleles are alternative forms of a gene that are located at the same place on a chromosome. Alleles may produce different characteristics in an organism, such as the shape of earlobes. In humans, the allele for a free earlobes dominates over the allele for attached earlobes.
This means that the free earlobes trait will be expressed, regardless of the genotype. A person can be homozygous for free earlobes, meaning they have two free earlobes alleles, or heterozygous for free earlobes, meaning they have one free earlobes allele and one attached earlobes allele. In either case, the trait that will be expressed is free earlobes.
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What component of the nucleotide is the red arrow pointing at?
The component of the nucleotide is the red arrow pointing at is thymine.
What is the nucleotide?
A nucleotide is described as a building block of nucleic acids, which are the molecules that carry genetic information in living organisms.
A nucleotide is composed of three parts: a nitrogenous base, a five-carbon sugar, and a phosphate group.
There are four main kinds of nitrogenous bases that can be used:
adenine (A), guanine (G), cytosine (C), thymine (T) in DNA, or uracil (U) in RNA.In DNA, the five-carbon sugar is known as deoxyribose, but in RNA, it is known as ribose.
Phosphorus and oxygen atoms make form the molecule known as the phosphate group. The backbone of DNA and RNA is made up of a long chain of nucleotides that are bonded together. Genetic information is encoded in the chain's nucleotide order.
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What is the function of meiosis? ( Concept 10.3)to make exact copies of the parent cellto make one cell with twice the number of chromosomes as the parent pairsto make four cells with the same chromosome number as the parentto make cells with a haploid (half that of the parents) number of chromosomesto make diploid spores
Meiosis is a type of cell division in which the parent cell has half as many chromosomes and produces four gamete cells. For sexual reproduction, this process is necessary to produce egg and sperm cells.
Meiosis reduces normal diploid cells, which have two copies of each chromosome per cell, to gametes, which have one copy of each chromosome per cell. These unique haploid cells that form during meiosis are eggs (female) or sperm (male) in humans.
Like mitosis, meiosis is a course of the atomic division. Meiosis, on the other hand, results in the creation of new cells with exactly half the DNA of the parent cell, whereas mitosis results in an exact copy of the chromosomes.
One parent cell can produce four gametes (eggs in females, sperm in males) during meiosis, which involves two distinct cell divisions. Cells go through four stages during each division cycle: metaphase, anaphase, telophase, and prophase.
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What might explain the observation that hare numbers typically peaked slightly before lynx numbers?
The observation that hares numbers typically peaked slightly before lynx numbers may be explained by a time lag in the predator-prey relationship.
As hare populations increase, there is an abundance of prey available for lynx, leading to an increase in the lynx population. However, as lynx populations increase, they will begin to prey heavily on hares, leading to a decline in the hare population.
This decline in the hare population will then lead to a decline in the lynx population as they run out of prey, resulting in a time lag between the peak populations of hares and lynx.
Additionally, environmental factors such as climate change and habitat destruction may also contribute to this observed pattern.
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The teeth that are best adapted for biting off hunks of food are the
Incisors are the sharp-edged teeth located at the front of the mouth, and they are well adapted for biting off hunks of food. The correct answer is A. incisors.
They have a chisel-like shape that allows them to cut through food, making them ideal for biting and cutting tasks. Incisors are typically used for grasping, cutting, and tearing food, such as fruits, vegetables, and meat, into smaller pieces that can be easily managed by the other teeth during chewing and swallowing.
Canines (B) are the pointed teeth located on either side of the incisors and are typically adapted for tearing and holding food. Bicuspids (C), also known as premolars, and molars (D) are teeth located towards the back of the mouth and are adapted for grinding and crushing food. While they play important roles in the chewing process, incisors are the teeth that are best adapted for biting off hunks of food.
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Complete Question
The teeth that are best adapted for biting off hunks of food are the
A. incisors.
B. canines.
C. bicuspids.
D. molars.
which statement among a-d is not applicable to flocculation, or floc formation, during wastewater treatment? a. filamentous bacteria enhance floc formation. b. optimal flocculation decreases the amount of bod entering effluent stream of wastewater. c. flocculation is important for the production of a clear effluent stream of wastewater. d. a balance between healthy floc formation and the activity of protozoans is necessary for optimal settling. e. a-d are all applicable.
The statement that is not applicable to flocculation or floc formation during waste water treatment is b. Optimal flocculation decreases the amount of BOD (biochemical oxygen demand) entering the effluent stream of wastewater.
In fact, flocculation helps to increase the removal of BOD from the wastewater by facilitating the settling of suspended solids.
Sewer and waste water are treated in four fundamental steps.
a) Screening stage - Grit removal equipment is used to remove big debris and trash from the waste water during this stage of treatment.
b) The initial phase of treatment (physical therapy)
After the screening stage, waste water treatment is subjected to physical processes including aeration, filtration, sedimentation, etc. to remove contaminants.
b) The chemical therapy stage of secondary treatment
Chemicals are employed in this stage to agglomerate minute contaminants into larger masses, making it easier to filter, sediment, and other processes to remove them.
d) Biological treatment at the tertiary stage
Microorganisms act on waste in this stage, working to eliminate organic contaminants from it whether oxygen is present or not.
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8.why is it important that weak forces, not strong forces, mediate biomolecular recognition? how do hydrophobic interactions drive formation of protein structures?
Answer:
Biomolecular interactions are mediated by weak forces because these forces are more easily reversed or modified allowing for more dynamic systems. Hydrophobic interactions drive protein structure formation because nonpolar side chains must be "buried" away from the water and polar side chains can reside on the surface, allowing water to remain as disordered as possible.
Explanation:
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What makes up the genetic code of ATTGCA
Question 58
A factor or agent which increases the risk of cancer is known as a
a. teratogen
b. mutagen
c. carcinogen
d. fomite
A Carcinogen is any substance or agent that has the potential to cause cancer in living tissues. It is different from a teratogen, which is a substance or agent that can cause birth defects or malformations in a developing embryo or fetus. A mutagen is a substance or agent that can cause changes or mutations in DNA, which may or may not lead to cancer.
Exposure to carcinogens can damage DNA and other genetic material, leading to mutations and alterations in cellular growth and division, which can increase the risk of cancer development. Examples of carcinogens include tobacco smoke, certain chemicals in industrial processes, ultraviolet (UV) radiation from the sun, some viral infections, and certain dietary factors. Teratogens, on the other hand, are agents that can cause birth defects in developing fetuses. Mutagens are agents that can cause changes or mutations in DNA, which may or may not lead to cancer. Fomite is a term used to describe inanimate objects that can carry and transmit pathogens, but it is not related to cancer risk.
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which of the following is an important function of the skin? question 8 options: control body temperature hold muscle to bone produce antibodies manufacture blood cells
An important function of the skin is to control body temperature. This is achieved through processes such as sweating and regulating blood flow near the skin's surface.
The skin is an essential organ in the human body that serves many important functions. One of the most important functions of the skin is to act as a barrier to protect the body from external elements such as bacteria, viruses, and other harmful substances. The skin also helps regulate body temperature by controlling the amount of sweat released and by absorbing or reflecting heat. It also helps to retain moisture and prevent dehydration. The skin also helps to protect the body from physical trauma such as cuts and bruises. It contains nerve endings that allow for the sensation of heat, cold, and touch.
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which combination of animals was domesticated in Southwest Asia?
a. water buffalo, pig, and chicken
b. Llama and alpaca
c. Cattle Camel, and goat
d. sheep and goat
e. yak and horse
Sheep and goat are the animals that were domesticated together in Southwest Asia.
Around 10,000 years ago, domestication of sheep and goats began in Southwest Asia. This area, commonly referred to as the Fertile Crescent, is home to contemporary nations including Turkey, Syria, and Iraq. Domesticating these animals gave early human communities in this area a consistent supply of meat, milk, and wool, which was very important for their growth. Sheep and goats were also relatively simple to handle, which made them perfect for early agricultural practises. Sheep and goat are still significant food and fibre sources in Southwest Asia and other parts of the world today.
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