Which of the following was NOT part of Darwin's explanation of natural selection? (a) Organisms ...

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Which of the following was NOT part of Darwin's explanation of natural selection?
(a) Organisms commonly produce more offsprings than can possibly survive
(b) Variations exist within each species
(c) Members of a species compete with each other for food and space
(d) The offsprings that are most fit possess traits which are best suited to the environment
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