A prerequisite for a terrestrial existence was the development of
A) a four-chambered heart.
B) an internally housed gas-exchange system.
C) lungs.
D) chitinous covering to strengthen gills.
E) countercurrent circulation.

Question

Quizplus · Accepted Answer

An internally housed gas-exchange system, such as lungs, is crucial for terrestrial existence as it allows organisms to efficiently exchange gases in a non-aquatic environment.

A Prerequisite for a Terrestrial Existence Was the Development of