A mass extinction event is one in which _____ percent of the existing species go extinct within a 2-million-year period.
A) 75
B) 95
C) 55
D) 25
Correct Answer:
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Q11: Nutrient cycling is an example of a
Q12: Cultural services are those that
A) humans use,
Q13: Flood control is an example of a
Q14: Which of the following is NOT a
Q15: Biodiversity hotspots throughout the world contain _
Q17: Provisioning services are those that
A) support ecosystems,
Q18: What is the difference between instrumental and
Q19: Why are regulating services considered instrumental values?
Q20: How many mass extinctions have occurred?
A) 5
B)
Q21: The period of the last _ may
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