Multiple Choice
Why doesn't a flatworm have a circulatory system?
A) The animal is thin enough to permit effective gas exchange by diffusion.
B) There is not enough room for a circulatory system because of the large gastrovascular cavity.
C) The animal lacks muscles, so it could not have a heart to pump blood.
D) Only bilaterally symmetrical animals need a circulatory system.
E) Only vertebrates have circulatory systems.
Correct Answer:
Verified
Correct Answer:
Verified
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