An experiment was performed to determine the health effects of different amounts of second-hand smoke on one-year-old hamsters. What is the Independent Variable of the experiment?
Answer:
Independent variable: different amounts of second-hand smoke
Explanation:
The independent variable in an experiment is the variable that the experimenter changes or manipulates in order to bring about a measurable response.
In this question, a test is being carried out to determine the health effects of different amounts of second-hand smoke on one-year-old hamsters. Based on this, the independent/manipulated variable is the DIFFERENT AMOUNTS OF SECOND-HAND SMOKE because it is the variable being changed.
How does DNA code for traits? Explain your response
Answer: ................................................................................................
Explanation:
What is the main function of the small intestine?(use terms : villi, surface area,blood capillaries,why must large molecules be broken down, high concentration and low concentration.)
Answer:
Among the principal functions of the small intestine, we might mention the peristaltic movement, secretion through special glandules, digestive function, absorptive functions, secretion functions, and endocrine functions.
Explanation:
The whole digestive tube is approximately eleven meters long, from the mouth to the anus.
The small or thin intestine is the longest organ of the digestive tube. It can reach up to 7 meters long, up to 3 centimeters in diameter, and it characterizes by being folded. These folds are called villi, they project into the intestine light, and they are more concentrated in the first portion of the intestine, the duodene, decreasing to the final region of the organ.
Among the principal functions of the small intestine, we might mention the peristaltic movement, secretion through special glandules, digestive function, absorptive functions, secretion functions, and endocrine functions.
The small intestine receives food from the stomach, and through peristaltic movements, it mixes and carries the material to different regions in the organ. The complex polymeric molecules are digested and transformed into simpler substances. The duodene receives secretions from intestinal glands such as bile and pancreatic juices and mixes them with digestive juices of its production. All of these secretions carry huge amounts of enzymes that will degrade food and transform it into soluble substances, such as amino acids. The intestine walls are covered by villi that increase the absorption surface area. Nutrients are absorbed by primary cells and transported to the bloodstream. Calciform cells secrete mucus to protect the epithelium during digestion. Villi also transport water from the blood to the intestinal tract, which helps in food decomposition. Enteroendocrine cells secrete hormones to the blood vessels and capillaries that enter each villus. When nutrients are small enough they go to enter the bloodstream.
Peyer's patches are nodules or cumulus of lymphatic tissue and other accessory cells, located under the mucosa of the gastrointestinal tract, specifically in the lamina propria of the thin intestine, in the jejunum region. These patches represent the mucosa´s immunity system. In the jejunum, these follicles are isolated from each other in the intestine and low concentrated. But in the terminal ileum (The last portion of the thin intestine) they get so close that they might form a plaque.
Which process takes longer, primary succession or glacial retreat?
Answer:
I think it is primary sucession
Explanation:
the process takes a long time
Which of the following statements about solid waste recycling is false?
A. Less expensive for customers who separate their trash before pick up than to use high technology recovery plants
B. Glass, iron and aluminum can be recovered from solid waste
C. Low tech resource recovery involves customers separating trash into categories like paper, glass, plastics and metals
D. High technology recycling provides many more jobs than low technology recycling
E. Materials recovery facilities need a large input of garbage to be financially successful
Answer:
D) High-technology recycling provides many more jobs than low-technology recycling
Explanation:
what would represent represent the genotype of a heterozygous pea plant?'
A.white
B.purple
C.PP
D.Pp
Answer:
Pp
Explanation:
Food we eat has not been modified through selective breeding.
a) True
b) False
*No wrong answers please.*
Answer: True.
Quizlet is a very good resource to use for problems like this.
Food we eat has not been modified through selective breeding. This statement is true.
What is selective breeding?Selective breeding is the process where individual organisms with certain desirable traits are selectively bred for the purpose of propagating that particular trait.
Selective breeding is applied in agriculture for the purposes of rearing or cultivating high yielding breeds of farm animals and crops.The food we eat has been modified through selective breeding. Hence the statement: Food we eat has not been modified through selective breeding.
Milk production selective breeding has bee applied in milk production by selectively rearing cows with high milk production as planting of disease-resistant crops selective breeding has been applied in the cultivation of disease resistant crops.
Therefore, Food we eat has not been modified through selective breeding. This statement is true.
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16
Select the correct answer.
Which type of evidence is often reviewed in microscopy?
OA physical evidence
OB.
trace evidence
OC. personal experience
OD
testimonial evidence
OE.
circumstantial evidence
Answer:
B. Trace Evidence
Explanation:
Trace evidence is like fiber or hair or gunshot residue to it would be B. Trace evidence
The physical evidence and trace evidence are both reviewed under microscopy. Therefore, option A and option B are correct statements.
What is microscopy?Microscopy is a technique to review the smaller size object at high magnification. Forensic science uses the physical or trace evidence found at the crime scene to review under microscopy.
Physical evidence refers to the tangible objects found at the crime scene, such as murder weapons or tool marks. On the other hand, trace evidence refers to the small or even microscopic pieces of evidence left at the crime scene, such as hair, or DNA.
Using the microscopy technique, the forensic team can determine the source of the murder weapon used at the crime scene or even link the suspect to the death of the victim. However, other types of evidence that do not come under microscopy, such as testimonial evidence or circumstantial evidence are also used to build a strong case against the suspect.
Therefore, the physical evidence and the trace evidence both are reviewed under microscopy.
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Red blood cells have a salt content of 0.9%. When a microbiologist places red blood cells in pure
water, osmosis occurs. What net movement of a substance occurs in this instance of osmosis?
a. water molecules move out of the cells
b. water molecules move into the cells.
c. salt ions move out of the cells.
d. salt ions move into the cells.
Answer:c salt ions move out of the cell
Explanation:
Salt is less than 1
Red blood cells have a salt content of 0.9%. When a microbiologist places red blood cells in pure water, osmosis occurs. This results into water molecules . Thus, the correct option is C.
What is Osmosis?Osmosis is the spontaneous net movement or diffusion of solvent molecules through a selectively-permeable membrane from a region of high water potential or lower solute concentration to a region of low water potential or higher solute concentration, in the direction which tends to equalize the solute concentrations on the two sides of the membrane.
It is of two types, on the basis of movement of solvent particles, when the solvent moves inside the cell it is called endosmosis which results into turgid cells and the movement of solvent molecules outside the cell which is called exosmosis that results into flaccid cells.
Therefore, the correct option is C.
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Heat energy is transferred on Earth by the processes of convection, conduction, and radiation. How does heat energy cause materials to move during convection? Complete the sentences below.
It causes denser materials to ______.
It causes less dense materials to ______.
Answer choices are Rise, Sink, Reflect, Absorb.
Answer:
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.
In heat transfer by convection, heat energy causes denser materials to sink and causes less dense materials to rise.
What is heat transfer?Heat transfer refers to the process by which heat energy is transferred from one point at higher temperature to another at lower temperature.
Heat energy is transferred on Earth by the processes of convection, conduction, and radiation.
Thus, during convection, heat energy causes denser materials to sink and causes less dense materials to rise.
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Hi, can somebody please explain this activity to me and what do I do for the graph here? Thanks.
What enrionmental factor can people with pku control to prevent building up extra phenylalanine in thier brains
Answer:
i-
Explanation:
Carrie conducted an experiment to see if listening to different types of music would affect a person’s pulse. Her hypothesis was that pulse rate would change with different types of music. She had 10 volunteers. Each of the first 5 volunteers listened to seven different music selections for 30 seconds each. The person’s pulse was taken before the music and after each 30-second interval of music was completed. The other 5 volunteers did not listen to music and had their pulse taken every 30 seconds for 5 minutes. Based on her experiment, Carrie concluded that a person’s pulse rate did change when the person listened to different types of music. Identify the control group, the experimental group, the independent variable, and the dependent variable.
Answer:
Independent variable: MUSIC
Dependent variable: PULSE
Control group: The 5 volunteers that did not listen to music.
Experimental group: The 5 volunteers that listened to seven different music selections for 30 seconds each
Explanation:
- Independent variable in an experiment is the variable that the experimenter changes or manipulates in order to bring about a measurable response. In this experiment, the independent variable is DIFFERENT TYPES OF MUSIC THAT WAS PLAYED BY CARIE.
- Dependent variable is the variable that responds to the changes made to the independent variable. It is the variable being measured in an experiment. The PULSE, which was measured in this experiment, is the DEPENDENT VARIABLE.
- Control group is the group of an experiment that does not receive the experimental treatment. In this experiment, the GROUP OF 5 VOLUNTEERS THAT DID NOT LISTEN TO ANY MUSIC is the CONTROL GROUP.
- Experimental group is the group that is subjected to the experimental treatment in an experiment. In this experiment, the GROUP OF 5 VOLUNTEERS THAT LISTENED TO SEVEN DIFFERENT TYPES OF MUSIC IS THE EXPERIMENTAL GROUP.
Chloroplasts and Mitochondria reproduce independently from the eukaryotic cell it is within.
True or false?
why the answer is C not D?
Answer:
Diffusion describes the movement of particles from an area of higher to lower concentration. That is what the ink is doing when it spreads throughout the jelly. Osmosis only occurs across a semipermeable membrane.
Answer:
osmosis is movement of particles through a semipermeable membrane from the region of high concentration to region of low concentration while diffusion is the movement of particles from a region of higher concentration to a region of lower concentration.
Explanation:
here there is no semipermeable membrane hence the correct answer is diffusion.
To obtain the energy needed for life processes, plants break down(blank)
of
to release stored chemical energy through the process of (blank)
А.
water photosynthesis
B
sugar respiration
С
sugar photosynthesis
D
water respiration
The mechanism by which plants convert carbon dioxide, water, and sunshine into oxygen and sugar-based energy is known as Photosynthesis.
What steps are involved in a plant's photosynthesis?Green plants and various other organisms convert light into chemical energy through a process called photosynthesis. Light energy is gathered and utilised during photosynthesis in green plants to change waters, carbon dioxide, and minerals into oxygen- and energy-rich organic molecules.
What makes photosynthesis so crucial?The significance of photosynthesis Solar or radiant energy is converted into chemical energy during photosynthesis. The production of agricultural crops is directly impacted by the rate of photosynthesis. All living things require oxygen, which it provides for the atmosphere. It keeps the ecosystem's carbon dioxide and oxygen levels in check.
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Question: What is it that lives if it is fed, and dies if you give it a drink?
A.fire
B,anaimals
C.humans
D.ants
Gregor Mendel studied pea plants to determine the patterns of inheritance. What is not a reason Mendel used pea plants in his experiments? Check all that apply.
Answer: Gregor Mendel, pea plants were fundamental in allowing him to understand the means by which traits are inherited between parent and offspring. He chose pea plants because they were easy to grow, could be bred rapidly, and had several observable characteristics, like petal color and pea color.
Explanation:
Answer:
B and D
Part 2 is C
Explanation: edge
what do chemical reactions do
Answer:
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Explanation:
Which of the following best explains why enzymes are necessary for many cellular reactions?
a.Enzymes supply the oxygen necessary for the reactions.
b.Enzymes change reactants from solids to liquids during the reactions.
c.The reactions take up too much space in the cell if the enzymes are missing.
d.The reactions are too slow to meet the needs of the cell if enzymes are mis
Answer:
C. The reactions take up too much space in the cell if the enzymes are missing.
Explanation:
Do you think these fish are an example of natural selection among two populations of the same species? Explain your answer.
Answer:
It depends on the fish (I do not see any pictures) Any fish is an example of natural selection.
Explanation:
A good example would be that polar bears grew and evolved to have white fur to blend in the snow to sneak upon prey. However, their brown bear counterparts failed to do that. So due to better camouflage and hunting technique, the polar bears survived more up north.
Answer:
The two fish are of the same species because they can mate with each other. Also, the characteristics of the blind cave fish enable them to live in caves. Eyes need energy. So, developing bodies with no eyes allowed these fish to function more efficiently.
Explanation:
What can you do to play an active role in cancer prevention?
Answer: Although humans cannot prevent all cancers, a healthy diet and weight followed by adequate exercise, sleep, and stress reduction all play a part in cancer reduction.
Cancer occurs when cells multiply uncontrollably and are not "cleaned up" by the body. We are dependent on our bodies recognizing and destroying old cells and foreign substances like toxins. When our body's fail to do this, either through stress, poor diet or being sedentary, cancer could result.
Hope this helps.
plz help me plzzzzzzzzzzzzz
Answer:
4.i.True
4.ii.False
4.iii.True
Water is made of three atoms. This means it is
What are the two types of venomous snakes? Describe each type and include an example.
Answer:
The King Cobra and the Black Mamba
EXPLANATION:
The black mamba is a species of highly venomous snake belonging to the family Elapidae. It is native to parts of sub-Saharan Africa. First formally described by Albert Günther in 1864, it is the second-longest venomous snake after the king cobra; mature specimens generally exceed 2 m and commonly grow to 3 m
The king cobra, also known as the hamadryad, is a venomous snake species in the family Elapidae, endemic to forests from India through Southeast Asia. It is threatened by habitat destruction and has been listed as Vulnerable on the IUCN Red List since 2010. It is the world's longest venomous snake.
Answer:
The two types of venomous snakes are Elapine snakes, and Viperine snakes. Elapine snakes have shorter fangs and venom that paralyzes the respiratory system. Cobras and coral snakes are Elapine snakes. Viperine snakes have longer hollow fangs and venom that attacks red blood cells. Rattlesnakes are viperine snakes.
Explanation:
hich is a similarity between alcohol fermentation and aerobic respiration?
Both require oxygen.
Both require light energy.
Both start with glycolysis.
Both produce alcohol.
Answer:
B they both give information
Explanation:
correct 2022
write essay about connective tissue?
please write correct answer
please help me, i dont like this
Answer:
This is true! Hope dis helps! :)
Explanation:
Answer:
True
Explanation:
I really hope this helped. I did this a long while back so I hope its right. Have a nice day :)
do trees Make their own energy every day
Answer:Trees and other green plants are the source of energy for all animal life to live and grow. Through the process of photosynthesis plants change light energy from the sun into chemical energy that is stored in the plant as carbohydrates (sugars) as it grows
Explanation:
Which biome is characterized by plants that drop their leaves in the winter
Answer:
temperate deciduous forests
Explanation: