Multiple Choice
Refer to the figure below showing changes in the diversity of vertebrate life forms inhabiting Earth over its history. 
Which statement is accurate and also describes factors that most contributed to the trend depicted in the figure?
A) The range of animal body forms increased tremendously over the history of life on Earth because cell differentiation opened up new structural possibilities.
B) Over time, animals have experienced increasing survival rates because evolution moves in the direction of improving on past forms.
C) Simple vertebrates slowly evolved into more complex vertebrates, because the more complex forms are more highly evolved.
D) Biologists are less able to document the variety of life forms that inhabited Earth the farther back in time they search for clues.
E) The environment on Earth has changed: it was least hospitable to life in its earliest stages but has grown more and more hospitable to life over its long history.
Correct Answer:
Verified
Correct Answer:
Verified
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