To learn more about this topic, start your googling with these keywords:

Evolutionary Mechanisms: Forces that change the frequency of genes in populations.

Natural Selection: The process whereby traits that make animals more likely to survive and reproduce take hold in a population.

Vestigiality: The process by which a genetically-determined structure loses some or all of its functionality.

Genetic Drift: A change in the frequency of an allele due to random sampling.


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