Some relatively large multicellular aquatic animals have no circulatory system.One way that these organisms manage gas exchange is by
A) bringing the external environment into a branched system of channels such that most cells are close to that environment.
B) hosting endosymbiotic bacteria that produce oxygen inside their tissues.
C) breathing air into a set of lungs.
D) basking at the surface periodically to allow for diffusion of oxygen.
E) having long diffusion distances.
Correct Answer:
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