The extinction that wiped out the dinosaurs resulted initially from
A) an asteroid impact.
B) the coming of the Ice Ages.
C) the formation of a supercontinent through continental drift.
D) global warming through a greenhouse effect.
Correct Answer:
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Q9: An important result of the evolution of
Q10: The earth was formed about
A)1 million years
Q11: At the time the earth was formed,the
Q12: The heavy elements that now make up
Q13: Most of the history of life on
Q15: How old is the first evidence of
Q16: The formation of the "supercontinent" of Pangea
A)was
Q17: The earth's continents drift because
A)they are actually
Q18: The sudden appearance of organisms with shells
Q19: Sexual reproduction probably evolved
A)to increase genetic variation.
B)to
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