Question

what is impossible without genetic diversity?
evolution
mutations
variety of characteristics
weak individuals

Explanation:

Genetic diversity provides the raw material (different alleles) for natural selection. Evolution is the process of change in a population's inherited traits over generations. Without genetic diversity (variation in genes), there would be no differences for natural selection to act on, so evolution (in terms of populations adapting and changing over time) couldn't occur. Mutations create genetic diversity, not the other way around. A variety of characteristics can exist due to other factors (like environmental - induced phenotypic plasticity to some extent) even if genetic diversity is low (but long - term maintenance is harder). Weak individuals can exist due to chance events or non - genetic factors (e.g., injury) not directly related to genetic diversity.

Answer:

evolution