In some freshwater organisms there is a structure called a contractile vacuole that regulates water movement into and out of the cell. what explains the existence of the cv? a) the cv prevents the organism from drying out. b) the cv assists the organism in capturing prey. c) the cv the organism move through the water. d) the cv the organism maintain osmotic pressure.

Well, since it regulates water movement, it wouldn't be B. and since it is water movement INTO AND OUT OF THE CELL, it wouldn't be C. Since the CV expels water from the cell by contracting, its main purpose is not A. The Answer Is D. because it helps the organism maintain osmotic pressure by taking in or releasing water.

x = 14

I am sure of the answer :)