Answer:
B
Step-by-step explanation:
Natural selection is the process by which certain traits become more or less common in a population over time. It occurs when individuals with certain traits are more likely to survive and reproduce than those without those traits, and as a result, the traits become more common in the population.
This process is driven by the environment, which "favors" individuals with the best phenotypes (physical characteristics) for survival. For example, if an environment is cold and snowy, individuals with thick fur will be more likely to survive and reproduce than those with thin fur, so the trait for thick fur will become more common in the population over time.
Option a, "People choose mating pairs based on desirable characteristics," is incorrect because natural selection is a process that occurs in nature, not as a result of human intervention. Option c, "If an anatomical feature is not used for several generations, offspring will cease to inherit that trait," is incorrect because traits are not lost due to disuse. Option d, "There is a trend towards homozygous dominant genotypes becoming the most common in the population," is incorrect because natural selection does not favor any particular genotype (the genetic makeup of an individual) over others.