How many mass extinctions mark the boundaries for geologic time periods?
A) One
B) Three
C) Five
D) Eight
E) Twelve
Correct Answer:
Verified
Q4: Endemic means a species _.
A) evolved
Q5: Habitat fragmentation can reduce biodiversity by _.
Q6: A species that has population levels so
Q7: Polar bears are top predators,and tests on
Q8: Sometimes,the decline of one species threatens the
Q10: Which type of species is most likely
Q11: The current extinction rate driven by humans
Q12: In _,an exposed organism accumulates increasing amounts
Q13: Which of the following is least likely
Q14: In a positive feedback cycle,drought encourages _,which
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