Vascular plants appeared about 450 million year ago.Vascular plants have existed on earth for ______.
A) 10% of its history
B) 20% of its history
C) 50% of its history
D) 75% of its history
Correct Answer:
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Q6: A scientist is studying endosymbiosis in cells.This
Q8: The oldest microfossils are of
A)prokaryotes.
B)eukaryotes.
C)insects.
D)pollen grains.
Q9: Which of the following was produced in
Q10: In the original experiments by Stanley Miller
Q11: The early Earth's reducing atmosphere probably contained
Q12: Imagine that NASA discovered a new planet
Q15: Which one of the following statements about
Q16: True multicellularity is a major characteristic of
A)all
Q17: All of the following were produced in
Q18: The group that probably gave rise to
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