Which are required for natural selection to occur

1. heritable variations for some traits

Explanation:

Assuming the options are:

heritable variations for some traits the ability of an organism to improve a trait during its lifetime equal probability of survival for all offspring fewer offspring than the environment can support

there are 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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