Based on the Extinctions of Birds and Mammals Known to Have

question 7

Multiple Choice

Based on the extinctions of birds and mammals known to have occurred over the last 400 years, human actions seem to have

• A) had little effect on the usual (or "background") rates of extinction found in the fossil record.
• B) increased extinction rates in these groups by 100 to 1,000 times the usual (or "background") rates of extinction found in the fossil record.
• C) actually decreased the usual (or "background") rates of extinction found in the fossil record.
• D) increased biodiversity and gene flow in regions intensively developed.

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