Vascular plants first appeared during the
A) Silurian.
B) Ordovician.
C) Cambrian.
D) Carboniferous.
E) Permian.
Correct Answer:
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Q60: At normal levels of oxygen,selection is _
Q61: Which statement about the Cambrian is false?
A)
Q62: Which of the following represents the correct
Q63: You are investigating a Triassic fossil bed.What
Q64: In the late Precambrian,the first _ evolved.
A)
Q66: The first flying animals were _,which first
Q67: The Cenozoic era began about _ years
Q67: The current geological period is the
A) Tertiary.
B)
Q69: Which statement about the Cambrian is true?
A)
Q70: The most dramatic mass extinction in Earth's
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