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Cnidaria and flatworms exchange gases and remove wastes by way of their: A) open circulatory systems.B) closed circulatory systems.C) gastrovascular cavities.D) moist skin surfaces.E) respiratory and excretory
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Cnidaria and flatworms exchange gases and remove wastes by way of their:

A) open circulatory systems.B) closed circulatory systems.C) gastrovascular cavities.D) moist skin surfaces.E) respiratory and excretory systems.

User AzNjoE
by
7.8k points

1 Answer

6 votes
The answer is D, moist skin surfaces.

Explanation:
Cnidaria and flatworms respirate and extreme through their skin via diffusion.
User Murad Al Wajed
by
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