_____ refers to the idea that more adaptive variants of an organism replace less adaptive variants of the organism over time.

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This is the definition of natural selection, a key concept in the theory of evolution. Organisms with advantageous traits are more likely to survive and reproduce, passing on those traits to their offspring and gradually replacing less advantageous variants in the population. Xenophobia refers to fear or dislike of strangers or foreigners, effective polygyny refers to a breeding strategy in which only certain males are able to mate with multiple females, and functionality refers to how well something performs its intended function.

_____ Refers to the Idea That More Adaptive Variants of an Organism