Question

which of the following is one of the four conditions necessary for natural selection to occur in a population?
fewer organisms are born than the habitat can support
mutation does not occur
organisms have identical characteristics
variation is inherited

Explanation:

Natural selection requires variation in a population, and for that variation to have an impact over generations, it must be heritable. More organisms are usually born than the habitat can support, mutations do occur and provide new variation, and organisms do not have identical characteristics.

Answer:

Variation is inherited