What is the main reason that mammals underwent adaptive radiation after the demise of the dinosaurs?
A) They had to adapt in order to physically survive the ice age.
B) The mammals had little competition so it was easier for them to evolve into the niches that were once occupied by the dinosaurs.
C) They had an "inner need" to become better suited to their environment.
D) No answer choice is correct.
Correct Answer:
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Q14: _ were the first vertebrates to live
Q15: The four defining characteristics of chordates are
A)segmentation,a
Q16: The vertebrates that lack jaws are called
A)rays.
B)turtles.
C)lampreys.
D)eels.
Q17: If the only chordate characteristic that adult
Q18: During the course of fish evolution,two of
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A)lack bony skeletons.
B)have dermal denticles.
C)have a keen
Q21: Mammals are different from birds in all
Q22: Generally the respiratory system in birds
A)is identical
Q23: Based on molecular data and skull features,what
Q24: Which of the following groups had made
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