Answer:
The answer is A. Changes in genetic structure of a population overtime.
Explanation:
Evolution is the set of changes in phenotypic and genetic characters of biological populations through generations. This process has originated the diversity of life forms that exist on Earth from a common ancestor, causing biodiversity to occur at each level of the biological organization, including those of species, population, individual and molecular organisms, which they are subject to evolutionary changes that underlie genetic changes, which in turn are influenced by factors such as natural selection, genetic drift, genetic flow, mutation and genetic recombination.
