A frog skeleton
A) has a vertebral column consisting of only nine vertebrae and a urostyle.
B) has a highly flexible vertebral column,an adaptation for transmitting force from the hindlimbs of the body.
C) is,like that of crossopterygian,entirely cartilaginous.
D) bears limbs with four digits on each hand and foot.
E) All of these choices are correct.
Correct Answer:
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