Which of the following is considered the key innovation that started chordates along the evolutionary path that led to vertebrates?
A) a flexible rod to which muscles are attached, which allowed lateral movement of the back
B) an internal endoskeleton
C) a skin covering the entire body to prevent desiccation
D) a hard shell encasing the body
Correct Answer:
Verified
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Q33: Mammals are the only vertebrates to possess
A)hair.
B)single
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A)thecodonts.
B)therapsids.
C)dinosaurs.
D)marsupials.
Q38: It is generally accepted that the vertebrates
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Q40: The mucous sheet produced by the endostyle
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