A-Level Environmental Science exam question:

Since the 1950s, the exploitation of the rare-earth elements has increased from a few tonnes per year to over 150 000t per year. They are used in a wide range of applications, including new developments in transport, electronics and healthcare.
Although the main metals used following the industrial revolution are still important, economic development since the mid 1900s has involved the use of relatively small quantities of a much wider range of metals.
Many rare-earth elements have a relatively high mean crustal abundance, but they rarely occur in locally concentrated deposits.
Figure 1.1 shows details of the reserves and production of rare-earth elements in seven countries.
Use the data in figure 1b to calculate the missing values

Explanation:

the answer to your question is A

Onion roots are used to see mitosis because of rapid growth at the onion tips and at the stage of mitosis,leaves of the plants has division in the cells but there is no mitosis. the correct answer is option D.

The significance of mitosis is that in the stage the chromosomes are paired and the pairing of this homologous chromosomes makes the chromosomes visible at the equatorial plate.

Leaves do not undergo cell mitosis as they do show the cell division  from various types of tissues but the mitosis is absent and the root cells show rapid division in the lateral sides and because of roots being the active site of division, these are considered more to see mitosis happening.

Thus, mitosis being absent in leaves takes the roots to be considered option.

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Answer:

The correct answer is C (The change of color allowed them to hide better from predators)

Explanation:

Before, the deer mice were easy prey for predators since their color stood out and the predators could find them. Therefore, the change of color allowed them to hide better from predators. You may be tempted to answer a, but if you read carefully it says "The change of color camouflaged them, which helped them HUNT better." Clearly A is wrong since deer mice don't really hunt.

Answer:

d. All of the above

Explanation:is correct. post protected

Answer:

All of them are the same word

Answer:

Some of the animals exhibiting asymmetry are flounders and hermit crabs. Adult flounders have both eyes on one side. Hermit crabs have a large claw on one side. In flowering plants, the thanksgiving cactus (Schlumbergera truncata) has irregular, asymmetrical flowers.

Explanation:

Answer:

hermit crabs  

Explanation:

The definition of asymmetry means that two parts of something are not exactly the same. A fiddler crab has one claw that is bigger than the other so that is an example that a fiddler crab's body has asymmetry.

It is incorrect to name basal nuclei as basal ganglia because the term 'ganglia' refers to clusters of cell bodies in the peripheral nervous system (PNS). The basal nuclei are a group of subcortical nuclei.

The basal nuclei are a group of subcortical nuclei located deep in the cerebral hemisphere and midbrain.

The basal nuclei can be defined as a region of the brain that is involved in muscle coordination and movement.

The term ganglia make reference to a group of neurons outside of the central nervous system in the peripheral nervous system (PNS).

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Explanation: Calcium phosphate and hydrogen ions undergo a reversible reaction with calcium ions, phosphoric acid and water. The products of the reaction are calcium ions, phosphoric acid and water. All of these exist in chemical equilibrium with the crystalline calcium phosphate.

Answer:

calcium ions, phosphoric acid and water

Explanation:

Calcium phosphate and hydrogen ions undergo a reversible reaction with calcium ions, phosphoric acid and water

Answer:

d generate offspring that carry parental genes

Answer:

since the parasympathetic divison causes the heart rate to decrease and the sympathetic divison causes the heart rate to increase this is an example of antagonistic innervation

Explanation:

Answer:

Explanation:

Satellite cells are small glia that surround neurons' sensory ganglia in the ANS. These resemble the astrocytes of the CNS and assist in regulating the external chemical environment. PNS satellite glia are very sensitive to injury and may exacerbate pathological pain.

Glial cells surrounding the neurons of neurons are satellite cells.

Glial cells are a type of cell that provide physical and chemical support to neurons and maintain their environment. Located in the central nervous system and peripheral nervous system.

Glial cells outnumber neurons in the brain and outnumber them by a ratio of 3:1. Although glial cells also have complex processes extending from their cell bodies, they are generally smaller than neurons and  lack axons and dendrites.

Oligodendrocytes form the myelin sheath around axons. Astrocytes supply neurons with nutrients, maintain their extracellular environment and provide structural support. Microglia clear pathogens and dead cells.

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The use of restriction enzymes and electrophoresis to generate a map of the DNA molecule is known as RESTRICTION MAPPING. This technique is used to map an unknown fragment of DNA.

Restriction enzymes are enzymes that cut a DNA fragment at specific nucleotides sites, thereby generally smaller fragments of DNA.

Restriction mapping is a strategy used to map unknown fragments of DNA by digesting them into smaller fragments and then identifying the specific sites of the DNA breakpoints.

Restriction mapping can then be used to create a diagram of fragments of DNA marked with specific sites where they are cut by specific restriction enzymes.

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Answer:

low cellular concentrations of sodium

Answer:

Glycoproteins are molecules that comprise protein and carbohydrate chains that are involved in many physiological functions including immunity. Many viruses have glycoproteins that help them enter bodily cells, but can also serve to be important therapeutic or preventative targets.

Explanation:

this is the correct answer happy

Answer: OK!

Explanation: Osmoregulation is the active regulation of the osmotic pressure of an organism's body fluids, detected by osmoreceptors, to maintain the homeostasis of the organism's water content; that is, it maintains the fluid balance and the concentration of electrolytes (salts in solution which in this case is represented by body fluid) to keep the body fluids from becoming too diluted or concentrated.

Hope i helped! :D

Answer:

more glucose to move into cells in muscles

Explanation:

Answer:

mouth, esophagus, stomach, small intestine, large intestine, rectum and anxs.

For plants, light is an external stimulant. Phototropism is a response to light that plants have. The plant responds by orienting its growth in the direction of the light.

A stimulus is an occasion or any change in the environment that causes an organ or tissue to have a certain functional response.

An external or internal trigger is possible. Sensitive to external stimuli like sound and touch are sense organs like the ear and sensory receptors like those in the skin.

Direct one-to-one stimulus-response reactions are the most basic sort of response. The stimulus is a change in the environment, and the response is how the organism responds to it.

A stimulation that comes from outside the organism is known as an external stimulus. Light is one example of an outside stimulation. Although it comes from outside the body, it has an impact there as well.

Thus, it can be concluded that light is an external stimulus.

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Answer:

a. Testosterone gland  

Explanation:post protected

Testosterone gland is not an accessory gland of the male reproductive system.

Testosterone is a hormone that is primarily produced in the testicles in males and in small amounts in the ovaries and adrenal glands in females. It is a vital hormone that plays a critical role in the development of male reproductive tissues and secondary sexual characteristics, such as muscle mass, bone density, and body hair growth.

Testosterone is also essential for maintaining sex drive and overall physical health in both men and women. The production of testosterone is regulated by the hypothalamus and pituitary gland in the brain, which release signals to the testes to produce testosterone.

Certain medical conditions, lifestyle factors, and aging can affect testosterone production and levels, which can have significant impacts on health and wellbeing. Treatment options are available to address testosterone deficiencies and imbalances.

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Answer:

He noticed that each finch species had a different type of beak, depending on the food available on its island. The finches that ate large nuts had strong beaks for breaking the nuts open.

Answer:

D

Explanation:

Rejection of a newly translated organ caused by development of cancerous cells in the organ

Answer:

the answer is should be C

Answer:

Bioremediation

Explanation:

Bioremediation means using living organisms to detoxify polluted ecosystems.

Answer:

mechanically gated channels; sensory receptors

Explanation:

Answer:

please mark as brains list

Explanation:

No hamsters can not eat dragon fruit because the seeds will choke them and also it has toxic things that hamsters can not eat, but only humans can, but here are the list of fruits they can eat.

Apple (seedless)

Banana

Blackberries

Blueberries

Cantaloupe.

Cherries

Cranberries

Answer:

cell growth control

Explanation:

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