The deer's habitat's water supply has been impacted by the drought. The largest deer are best equipped to scale difficult terrain to reach distant natural springs, whereas the tiniest deer require the least amount of water to survive.
Natural selection that discriminates against the typical person in a population is known as disruptive selection. This kind of population would consist primarily of phenotypes (individuals having sets of features) at either extreme and very few individuals in the middle.
In essence, it depends on which members of the group have the highest chances of surviving—those who get to mate. They are the ones with characteristics that lie at the very edges of the spectrum. The person who only possesses average traits does not fare as well in terms of surviving and/or reproducing to pass on "average" genes.
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