Compared with Past Estimates,extinction Rates Are Currently High

question 29

Multiple Choice

Compared with past estimates,extinction rates are currently high.What is the most plausible explanation for this increase?

• A) Natural fluctuations in climate are causing extinctions.
• B) Continental drift is causing rapid changes in climate; these changes, in turn, cause extinctions.
• C) Previous extinctions make survival of contemporary species more difficult.
• D) Humans are affecting many aspects of the global environment.

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Definitions:

Growth

The process of increasing in physical size, strength, or number; can also refer to development in personal or professional domains.

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