Before the present, the most recent time of mass extinction of species occurred ____ years ago.
A) 65 million
B) 500,000
C) 15,000
D) 1,500
Correct Answer:
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Q5: Biodiversity refers to:
A) the total mass of
Q6: The largest pool of carbon in the
Q7: What was the cause of the Dust
Q8: Which of these states was the most
Q10: Recent trends show that as human population
Q11: About what percent of species have been
Q12: Adding iron-rich particles to the ocean is
Q13: Decomposition of organic matter:
A) returns nutrients to
Q14: The second largest pool of carbon is
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