Which organisms on the chart are the most closely related

the answer is tropical areas. the tropical areas obtain more

radiant energy from the sun than they lose to space through terrestrial

radiation, and vice versa for polar areas. earth has an energy remaining in the

tropics and an energy scarcity for the polar areas.

explanation:

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."