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In which of the following scenarios would evolution by natural selection cease to occur?


A) Humans become extinct because of a disease epidemic.
B) A thermonuclear war killed most living organisms and changed the environment drastically.
C) Genetic recombination and mutation stopped, and organisms could reproduce only asexually.
D) Ozone depletion led to increased ultraviolet radiation, which caused many new mutations.

E) None of the above
F) C) and D)

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