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
E) amniotic egg
Correct Answer:
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Q28: Reptiles can maintain their internal body temperature
Q29: Which of the following living reptiles care
Q30: Small,fishlike marine chordates,pointed at both ends with
Q31: Mammals are thought to have evolved from
A)thecodonts.
B)therapsids.
C)dinosaurs.
D)marsupials.
E)archosaurs.
Q32: Mammals are the only vertebrates to possess
A)hair.
B)single
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Q35: Birds,like mammals,can regulate their body temperatures within
Q36: It is generally accepted that the vertebrates
Q37: The changes that were necessary to cope
Q38: The mucous sheet produced by the endostyle
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