Which describes commensalism?

a. one organism benefits and the other is not harmed.

b. both organisms are harmed.

c. one organism is harmed and the other benefits.

d. neither organism is not harmed.

A

Explanation:

Commensalism is when two organisms associate and one benefits and the other doesn't - and isn't harmed. :)

because they are eaten by the frog and the frog getseaten by the snake and the snake by the eagle

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.