3
QuizMultiple Choice

Population Genetics

Question 3 • 112 CCHS Environmental Science

R-organisms reproduce at a very high rate. Knowing this, why don’t they usually reach their carrying capacity?

Answer
A
They live in environments with many predators that feed on them.
B
They are regularly killed off by disease and/or drought.
C
Their life span is too short.
D
a and b only

Explanation

R-organisms reproduce quickly, but high birth rates do not prevent population losses from environmental pressures. Predators can consume many individuals, and disease or drought can cause populations to decline before they reach carrying capacity. Both statements a and b are reasons, so the correct choice is “a and b only.”

AI-written and checked against the verified answer.

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