Species change refers to the process by which populations of organisms evolve over time, leading to differences in physical or behavioral traits among individuals within a population or between different populations.
Evolution: The process by which different kinds of living organisms are thought to have developed and diversified from earlier forms during the history of the earth.
Genetic Variation: The diversity in gene frequencies within a population.
Speciation: The formation of new and distinct species in the course of evolution.
AP Biology - 7.1 Introduction to Natural Selection
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