Where are Earth's most diverse and productive biomes located? A. Throughout Europe
B. Near the North Pole
C. In the United States
D. Near the equator

D. Near the equator

Explanation:

Near the equator, there are more productive biomes. Species diversity is higher at the equator than at the poles.

thinking it would be physical characteristics

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.