You are studying soil samples from a particular area. You notice a reddish color present in the soil. Explain the weathering process that contributed to the soil's color.

c.more precipitation,but only when emission levels.

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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.