In Comparison to Past Estimates,extinction Rates Are Currently High

question 57

Multiple Choice

In comparison to past estimates,extinction rates are currently high.Which of the following is the MOST plausible explanation?

• A) Natural fluctuations in climate causes extinctions.
• B) Continental drift is causing rapid changes in climate, which, in turn, causes 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:

Frowning

A facial expression typically denoting disapproval, concern, or puzzlement, characterized by furrowing of one's brow.

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A sleep disorder characterized by difficulty falling asleep, staying asleep, or experiencing non-refreshing sleep.

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Information related to patterns, quality, and duration of an individual's sleep, often collected for diagnosing sleep disorders or for research purposes.

Afternoon Nap

A short period of sleep taken during the afternoon, often to refresh or compensate for inadequate sleep at night.