Answer:
B) Random fluctuations in the gene frequencies within a population
Explanation:
Genetic Drift Examples. Genetic drift is a change in the frequency of an allele within a population over time. This change in the frequency of the allele or gene variation must occur randomly in order for genetic drift to occur. ... Examples of genetic drift are more evident in smaller populations of organisms.
Answer:
D. Play with her parents, primary caregivers, and toys
They are able to respond to the presence of invading organisms because they recognize the<u> antigen </u>on the surface of organisms. There are specific receptors on the surface of immune system cells.