Evolutionary adaptations that help some animals directly exchange matter between the cells of their body and the environment include ________.
A) a gastrovascular cavity, a two-layered body, and a torpedo-like body shape
B) an external respiratory surface, a small body size, and a two-cell-layered body
C) a large body volume, a long, tubular body, and a set of wings
D) an unbranched internal surface, a small body size, and thick covering

Question

Quizplus · Accepted Answer

An external respiratory surface is necessary for direct exchange of gases, a small body size increases surface area to volume ratio and facilitates exchange, and a two-cell-layered body allows for efficient diffusion of substances.

Evolutionary Adaptations That Help Some Animals Directly Exchange Matter Between