Assertion: natural selection's theory | /r/HasProperty | the process
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Source sentences:
text: It is a unifying idea for all of biology, and it also explains how the theory of evolution (the process by which living things change over generations) actually works.
text: The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits.