The vertebrate jaw first appeared in which organism?
A) fishes
B) amphibians
C) reptiles
D) birds
E) mammals
Correct Answer:
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Q47: Which modern reptiles have a four-chambered heart?
A)snakes
B)turtles
C)lizards
D)crocodilians
E)amphibians
Q48: Four of the five answers are used
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Q51: What is the most likely reason for
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