The diversity of structure, function, and behavior in living organisms is primarily the result of

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The diversity of structure, function, and behavior in living organisms is primarily the result of evolution, which occurs over millions of years through natural selection, genetic drift, and other mechanisms. These processes lead to the accumulation of genetic and phenotypic variation within and between populations, ultimately giving rise to the vast array of species and traits that we observe in the natural world. While reproduction, heredity, chance and artificial selection all play important roles in shaping evolutionary outcomes, none of them alone can account for the full extent of biological diversity.

The Diversity of Structure, Function, and Behavior in Living Organisms