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Global Systems
KROCCTC
2. In the tundra, what is the difference between the biotic and abiotic
factors you saw in the image?
Type your answer here
3. How do the biotic and abiotic factors you circled interact?
Our answer there,
4 of
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2/31/2020

just go with your heart buddy

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

c is the answer to this question. altitude affects the weather because air molecules evaporate.