Question

The structures that an animal uses to exchange gases with its surroundings make up the

A. digestive system
B. respiratory system
C. excretory system
D. circulatory system

Answer 1

The structures that an animal uses to exchange gases with its surrounding makes up the respiratory system. This is because respiration deals with the exchange of gases in and out of the body. And since the structures are for exchange of gases, then they are related to respiration. So the answer is B. Hope i helped.

Answer 2

B. Respiratory system. I hope this wasn't too late!