Variation within individuals in a population is brought about through and while pressures exerted by results in differential survival and reproduction, and adaptation to the environment.

mutation and sexual reproduction, natural selection

Explanation:

Variation within individuals in a population is brought about through mutation and sexual reproduction, while pressures exerted by natural selection results in differential survival and reproduction, and adaptation to the environment.

Mutation is a change in gene structure which causes variation in population of individuals, examples are albinism, dwarfism.

Sexual reproduction also results in increased variation in a population, it involves the fusion of the male and female gamates (gene transfer from male and female parent) resulting in variation in the offspring.

Natural selection is the process whereby organisms struggle to survive in an environment by adaptation. Any organism which fails to adapt to the prevailing environment dies out.

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.

a) which ethnic groups live in this community?

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