How Is It That Animals Such as Hydras and Flatworms

question 37

Multiple Choice

How is it that animals such as hydras and flatworms do not have a traditional circulatory system,yet they are capable of gas exchange?

• A)Hydra and flatworms exchange gases across the cells that line the gastrovascular cavity.
• B)Hydra and flatworms exchange gases across the cells of their coelom.
• C)Hydra and flatworms exchange gases across the cells of their gill cavity.
• D)Hydra and flatworms exchange gases across the cells of their skin performing cutaneous respiration.
• E)Hydra and flatworms exchange gases across the cells of their lungs.

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