This satellite image of the Amazon river reveals
how it has changed its
course over time. What
two processes are
responsible for this
phenomenon?

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.

. the sierra madre fault zone of southern california

. the san andreas fault california

b. climate change will cause an increase in biodiversity of all ecosystems.

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