Study the illustration.
Which term best describes the circular, enclosing structure
formed by the cell membrane in squares 3 and 4?
O sac
O vesicle
O lysosome
O enzyme

The difference between the  age structure graphs of non growing, slowly growing and rapidly growing countries is the birth rate and death rate of countries in each class.

There are so many countries in the world and each of the countries that we have in the world is unique in terms of the demography of the country. The demography has to do with the distribution of the people in a place according to age, sex and geographical location.

For the rapidly growing countries, we would notice that the age structure lies mostly towards the elderly. This implies that the birth rate and the death rate of the population ha achieved a sort of equilibrium.

For the slowing growing countries, the birth rate remains high but not so much as high as the non growing countries. This implies that the population of the countries are also within a manageable limit.

For the nongrowing countries, the birth rate is very much higher than the death rate thus there is a population explosion which puts pressure on the economy.

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Answer: Enables the spermatozoa to penetrate the ova

Explanation: It contains certain digestive enzymes (hydrolytic enzymes) that helps the sperm to tunnel through the zona pellucida of the ova. It mediates the union and binding of the membrane with the egg.

The thing that all biogeochemical cycles have in common are that c. they are all essential for sustaining life on earth.

In the field of ecology, a biogeochemical cycle can be described as a process by which an essential substance or element is transferred among the biotic and abiotic components of the ecosystem.

The material revolves around the earth as well as the atmosphere and is recycled. The biogeochemical cycles such as the carbon cycle, and nitrogen cycle. water cycles etc are all essential for the sustenance of life on Earth.

Without the biogeochemical cycles, resources will not be recycled in the environment and there will be a depletion of resources.

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Answer:

The process of mitosis generates new cells that are genetically identical to each other. Mitosis helps organisms grow in size and repair damaged tissue. Some species of algae are capable of growing very quickly.

Explanation:

I hope this will be helpful for you.

All the potential processes (meiosis and cytokinesis) are completed but the daughter cell could have missing or extra chromosomes if the cell received a stop signal at this checkpoint but was able to continue to anaphase anyway.

The cell checks whether each sister chromatid is appropriately connected to the spindle microtubules at the M checkpoint, also known as the spindle checkpoint. The cycle won't continue until every chromosome is firmly linked to at least two spindle fibers from opposite poles of the cell, as the separation of the sister chromatids during anaphase is an irreversible process. The cell's internal signaling pathways are activated or inactivated by a group of essential proteins by the m checkpoint, which is one of the internal and external stimuli that advances the cell cycle.

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The function of the indicated elastic lamellae of the aorta is to allow the aorta to maintain blood pressure without tearing in response to receiving blood under high pressure and then to conducting blood onwards.

This elastic lamellae works as a means of barrier between the smooth muscle and the endothelium. It happens that this layer also forms the outermost part of the blood vessels. Because of this characteristic feature, they help to regulate and maintain the pressure from blood flow which flows down distally.

So therefore, it can accurately be concluded that this elastic lamellae helps in regulating the blood pressure in the vessels.

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Answer:

technology

Explanation:

that was the answer choices so im not sure if its true of false all i know its technology

not sure if it will help but have a nice day

A gene can have many variants, which produce physical differences in individuals.

Genetic variations can arise from gene variants (also called mutations) or from a normal process in which genetic material is rearranged as a cell gets ready to divide (known as genetic recombination). Genetic variations that alter gene activity or protein function can introduce different traits in an organism these are differences between individuals inherited from parents, such as the color of your eyes, hair, and skin. Environmental variation - these are differences between individuals that are not inherited but caused by the environment that the organism lives in, including scars and tattoos. Genetic diversity has three different sources: mutation, recombination, and immigration of genes. Alleles are essential because they account for the differences in inherited characteristics from one individual to another. There are a total of 324 million known variants in human genomes

so we can conclude that physical differences in individuals are produced from  the presence of many variants of gene.

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Answer:

first page is good  2 page might want to look over again or have a parent help you

Explanation:

Locations like Antarctica would be least likely to experience an earthquake because they have less or no faulty lines.

Earthquakes are the tremors that occur inside the surface of the earth due to the slipping of tectonic plates against each other. The frequency of earthquake depends upon various factors like distance from the epicenter, the intensity of slippage of tectonic plates, etc.

Faulty lines are the fractures that are present between two rocks inside the Earth's surface. Since plain region do not have rocks that is the reason why faulty lines cannot be found there and hence earthquakes are also less, as their rapid movement causes earthquake.

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A plant can make 2 molecules of glucose with 12 molecules of both CO2 and H2O.

6CO2 + 6H2O +light energy = C6H12O6 + 6O2.

According to the equation, one molecule of glucose is created when six molecules of carbon dioxide react with six molecules of water.

Therefore, 2 molecules of glucose would result from the combination of 12 molecules of carbon dioxide and 12 molecules of water.

With the molecular formula C6H12O6, glucose is a simple sugar. Monosaccharides are a subgroup of carbohydrates, and glucose is the most prevalent one. In order to create cellulose, the most prevalent carbohydrate in the world, glucose is primarily produced by plants and the majority of algae during photosynthesis from water and carbon dioxide with the help of solar energy.

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The constituent substances of air are water vapor, carbon dioxide, oxygen, argon, and nitrogen.

The major constituents of air are Nitrogen, Oxygen, and Carbon dioxide gas because they are present in large amounts. The composition of the atmosphere i.e. air mostly consists of nitrogen and oxygen and also contains small amounts of argon, carbon dioxide, and trace amounts of other gases like helium, neon, methane, krypton, and hydrogen. The major constituent of air is 78% nitrogen, 21% oxygen, and 1% of other gases, dust particles, impurities, and water vapor. Nitrogen, oxygen, water vapor, argon, and carbon dioxide take up about 99% of the composition of air.

So we can conclude that water vapor, carbon dioxide, oxygen, argon, and nitrogen are present in the composition of air.

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If replication had to be accomplished in an 8-hour s phase and replication forks moved at 50 nucleotides/second, The minimum number of 46 origins required to replicate the human genome.

A double-stranded DNA molecule is copied during replication to create two identical DNA molecules. One of the most fundamental processes that take place within a cell is DNA replication. Between the G1 phase and the G2 phase, the cell cycle's S phase (also known as the "synthesis phase") is when DNA replication occurs. Since precise genome duplication is essential for effective cell division, the S-phase mechanisms are strictly regulated and highly conserved.

Before the interphase, in the S phase of the cell cycle, DNA synthesis or replication takes place. By doing this, the cell's genetic material is copied before mitosis or meiosis, leaving enough DNA for cell division.

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When we begin to heat the pot and the water, the water particles should slide past each other faster, and the iron particles should vibrate faster. Option C

The term temperature refers to the degree of the hotness or the coldness of an object. Much more, the temperature of an object has to do with the measure of the average kinetic energy of the molecules of the body..

Thus, when we begin to heat the water and the iron pot, we know that the kinetic energy of the molecules of the water and the both would increase. This is due to the acquisition of energy in the form of the heat applied.

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An enzyme may get denatured and cease to function at extremely high temperatures. There is an ideal pH range for each enzyme. Beyond this range, pH variations will restrict enzyme activity.

The vital function of enzymes is to reduce its activation energy of a reaction, or the amount of power needed for the reaction to start. In order to facilitate the chemical bond-forming and friendship processes, enzyme bind to reactant molecules and keep them in place.

Helicase, primase, Enzyme dna, and ligase are the four primary enzymes that aid in Replication of dna.

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Increased NADP+ levels would be the most likely outcome of a mutation that prevented noncyclic photophosphorylation in organisms that use photosystems ii and i during photosynthesis.

NADP+ levels are somehow raised while preventing noncyclic photophosphorylation due to  Mutations that are frequently light-sensitive during photosynthesis. There are other mutants that have been chosen for their higher resistance to photosynthesis-inhibiting herbicides or to plastid translation inhibitors. most pleiotropic mutations in the photosynthetic apparatus. The remaining subunits of a complex are generated when one subunit is missing, but they are improperly put together and quickly deteriorate, affecting all of the complex's components.

This feature makes it more difficult to pinpoint the underlying lesion in a mutant, but it also highlights very active proteolytic surveillance. Although at a late stage, this proteolytic system may work in a posttranslational process to control the stoichiometric accumulation of the subunits of each complex.

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Answer:

The sun's heat causes differential heating of the earth's surface and water bodies causing changing wind patterns.

Explanation:

The amount of sunlight received varies on various factors like

1. Insolation

2. Latitude

3. Altitude

Maximum sunlight is received at the equator while minimum sunlight is received at the poles.

Because of varying amounts of sunlight received, the surface and water bodies heat differently. This causes the wind over the surface to warm and cool differently.

The warm air being lighter in weight rises and is replaced by the heavier colder air. This leads to the formation of wind patterns.

The global winds are called trade winds.

A keratin protein is a major type of fibrous protein found in diverse body tissues such as hair, and epidermis.

The epidermis is the most superficial layer of the dermis, which is ainly composed of keratin and forms an epithelial tissue that covers the body and functions as a barrier to protect it from environmental factors.

Moreover, keratin is a fibrous protein because it forms a longed polypeptide chain whose tertiary structure is similar to fiber. The fibrous proteins include the diverse type of polypeptides found in body tissues (i.e., collagen, elastin, keratin, fibrin).

Therefore, we can conclude that keratin is a fibrous protein that forms a long polypeptide chain and it can be found in diverse tissues of the body such as, for example, the epidermis or hair.

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The plants and snails build larger carbon-based molecules from sugars the plant produce during photosynthesis. Option D.

Photosynthesis is a biological process during which plants make use of inorganic substances to make carbohydrates. The inorganic molecules are water and carbon dioxide and the process is powered by solar radiation from the sun.

When plants make carbohydrates in the form of sugar, they utilize them to make other carbon-based molecules and grow as a result.

Snails are not able to synthesize sugar on their own. Instead, they feed on plants and make use of the sugar synthesized by plants to build carbon molecules. The molecules are then used to build cells and tissues in order for the snail to grow.

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Answer: I'm pretty sure it's sugars.

Explanation:

I think they use it as their food.

Answer:

Sexual reproduction requires two parents. Each parent contributes a gamete - a sex cell that has half of the normal DNA of a regular body cell. In males, the gametes are sperm and in females, the gametes are eggs.

When these two gamete combine during fertilization, the result is a zygote, which then continues to develop into an embryo.

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The number of cells of Staphylococcus aureus present into the open wound, which divides by binary fission once every 30 minutes, after 30 minutes, one hour and 12 hours will be 2, 4 and 1.7 × 10⁷ cells respectively.

Binary fission is the method of asexual reproduction. It is the process by which a cell divides to form two daughter cells.

According to the question, the cell divides into 2 once after every 30 minutes.

The number of cells can be calculated by the formula: 2ⁿ

(where n = number of times the cell will divide in the given time period)

Therefore after 30 minutes, number of cells = 2¹ = 2.

Similarly, after 60 minutes, number of cells = 2² = 4.

In 12 hours, the cell will divide 24 times,

Hence the number of cells will be = 2²⁴ = 1.7 × 10⁷ cells respectively.

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An attribute of COVID-19 is excessive inflammation, which is controlled by regulatory T cells (Tregs)

An attribute of COVID-19 is excessive inflammation, which is controlled by regulatory T cells (Tregs). In addition to an intriguing role for interleukin (IL)-6 and IL-18, we discovered a noteworthy profile in Tregs from patients with advanced disease. Severe patients were distinguished from healthy people by the production of proinflammatory mediators and an improved suppressive profile that comprised increased Treg proportions. This suggests that these cells had a negative impact on COVID-19 and that there might be a cause for some of the recovery-related issues that are still mostly unexplored. The prognosis of tumor-infiltrating Tregs, which frequently exhibit this tendency, is generally poor.

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Answer:

Symbiotic bacteria

Explanation:

Symbiotic bacteria live in the mussels' gills. Like the microbes living inside tubeworms, these bacteria use energy from chemicals in the vent fluids to produce sugars.

1) The controversy about stem cells is the fact that life is destroyed in order to obtain it.

2) The  early-stage embryos are used as the source for embryonic stem cells. If they are not used for stem cells, they would develop to become babies.

3) The use of the stem cells must result in the death of innocent lives.

The term stem cell has to do with the kind of cells that could be used in the treatment of certain conditions that require the regeneration of cells. These are those kinds of cells that would lead to a possible cure for some very serious diseases such as the sickle cell anemia and damaged joints and spinal injuries.

There have been a lot of controversies that surround the stem cells because of the fact that it involves obtaining the stem cells from  early-stage embryos and these can only be obtained during the cause of abortion. The early-stage embryos are destroyed after the stem cells are harvested so they never make it to the world.

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C. the heavy metals have a synergistic relationship when combined

can scientists infer about the possible reason for the illnesses in the town.

As a result, high metal exposure may be hazardous. The kidney is the first organ to be affected by heavy metal poisoning due to its tendency to reabsorb and accumulate divalent metals. The degree of kidney damage caused by heavy metals is determined by the type, dosage, route, and duration of exposure.

Toxic metals, especially "heavy metals," are metals and metal compounds that are harmful to people's health. This article discusses certain poisonous semi-metallic elements, such as arsenic and selenium. Many of these metals are required in trace amounts to sustain life.

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Capillary action cohesion, Amazing water adhesion, bubbling beakers specific heat capacity, Magic pepper polarity , and pouring water  demo capillary action.

Like molecules (of the same substance) have the ability to adhere to one another due to attraction to one another, which is known as cohesion. Adhesion is the ability of certain molecules or surfaces to stick to one another. Solids, for instance, have high cohesive qualities, which prevent them from adhering to surfaces with which they come into touch. Gases, however, have a poor cohesiveness. Water is cohesive and sticky in nature. A sphere is created when water molecules adhere to one another. Cohesive forces have produced this. Water molecules reaching the container's surface are at a greater level when enclosed in a tube (see Meniscus). This is a result of the adhesive force between the molecules of water and those of the container.

Magic pepper is an experiment in which pepper polarizes easily , the electrons move to one end of the pepper gain and protons move to the other end . Capillary action is the movement of water within the spaces of a porous material due to the forces of adhesion , cohesion and surface tension.

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