Which occurs when the body responds to the environment by maintaining a stable internal environment despite changing
external conditions?
O spontaneous generation
O homeostasis
growth and development
O reproduction
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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.

1) a

2)c

3)a

4)c

5)b

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