Evolutionary adaptations that diverse animals directly exchange matter between cells and the environment include evolutionary adaptations that diverse animals directly exchange matter between cells and the environment include an external respiratory surface, a small body size, and a two-cell-layered body an unbranched internal surface, a small body size, and thick covering a gastrovascular activity, a two-layered body, and a torpedo-like body shape a large body volume, a long, tubular body, and a set of wings