Question

What must be present first in order for natural selection to occur???​

Answer 1

In order for natural selection to occur there must be a change in the environment(I.e. natural disasters, predators, food source change, etc.) and then one of two things must happen: either all
Of the organisms die out in that population, or some survive and reproduce and all of the organisms have better suited traits for their environment

Answer 2

Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.

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