Extinction of less adapted species from "summary" of On the Origin of Species By Means of Natural Selection by Charles Darwin
The process of natural selection inevitably leads to the extinction of less adapted species. As new and better-adapted species arise through the gradual accumulation of advantageous variations, those species that are less well-suited to their environment will struggle to survive and reproduce. This struggle for existence is a fundamental principle of natural selection, as individuals within a population compete for limited resources. Those individuals that possess variations that give them an advantage in this competition are more likely to survive and pass on their advantageous traits to the next generation. Over time, this process results in the gradual improvement of a species' adaptation to its environment. As species beco...
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