Sexual selection the process of speciation through the deliberate selection of mating partners, whereby some traits are preferred in mating partners over others, resulting in those traits being amplified. It occurs alongside natural selection, whereby fitness to the natural environment is selected for. The theory of sexual selection was introduced by Charles Darwin as part of the process of biological evolution. Read more about it on Wikipedia: https://en.wikipedia.org/wiki/Sexual_selection.

One example of sexual selection is deer antlers. Females prefer males with larger antlers which appear attractive and can be used as a weapon, so larger antlers are selected for because those deer are more likely to be able to reproduce. (https://www.sciencedirect.com/science/article/pii/S000334721830054X)
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