Question

question 15
the result of ____ over evolutionary time spans is that alleles that allow organisms to survive and reproduce at a higher rate than other individuals become more common in the population.
homology
artificial selection
natural selection
gene flow

Explanation:

Natural selection is the process by which organisms with favorable traits (alleles) are more likely to survive and reproduce, leading to an increase in the frequency of those alleles in the population over evolutionary time. Homology refers to structural or genetic similarities due to common ancestry. Artificial selection is human - directed breeding. Gene flow is the transfer of genetic material between populations.

Answer:

C. Natural selection