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aliya0001 [1]
3 years ago
8

What types of molecules can move directly across the cell membrane?

Biology
1 answer:
astraxan [27]3 years ago
5 0

Answer:

Small hydrophobic molecules and gases.

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Which type of mutation cannot occur in a child after birth?
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This type of mutation is called somatic mutation. It usually happens in different cells of the body, but not in the eggs and sperms. These mutation may cause cancer and other illnesses, but it cannot be passed on to future offspring.


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A hiker enters an area where lichens, mosses, and fungi are growing. Which statement best describes this ecosystem?
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It is populated with pioneer plants.

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A population contains short plants and tall plants . The short plants are not able to compete with tall plants for sunlight . Th
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<span>Stabilization Selection

In Stabilization Selection there is a decrease in the amount of variation. In the case of Stabilization Selection, selective pressures must select against two extremes of a particular trait. Two opposing selection pressures will combine to maintain a median height. Rather than resulting in extremely tall plants or extremely short plants, the majority of the plants in this population will be of medium height.</span>
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5. List three mechanisms by which Earth's albedo can be increased.
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Explanation:

1. A decrease in the number of greenhouse gases that humans produce will result in lowered global temperatures. This will allow the ice sheets in the polar regions to increase increasing also albedo.

2. Using light-colored building materials on houses and pavement in urban centers will work towards increasing albedo as more sunlight is refelcted back by built environments.

3. Decreased deforestation/increase in aforestation increases the earth’s sirface albedo because vegetation reflects back more sunlight than the earth’s bare surface.

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The graphs below show the changes in crab color at one beach.
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C. Both light tan and dark tan body color provided an advantage to the crabs on this beach, but not necessarily in other crab habitats.

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This disruptive selection occurs when individuals with extreme traits on both ends of the spectrum become selected against individuals of ntermediate or medium traits.

In the case of the crab, their environment favors the selection of both extreme values as against those intermediate individuals, as both light tan and dark tan body color of the crabs gives them advantage over others in this particular environment. This may only be obtainable in this environment or similar beach environment with the same settings and conditions.

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