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 become better adapted to their environment, they are more successful in competing for resources and reproducing. This success can lead to the decline of less adapted species, as they are outcompeted by their better-adapted counterparts. In some cases, the less adapted species may become extinct, unable to compete effectively in the changing environment. The extinction of less adapted species is a natural consequence of the ongoing process of natural selection. It is not a deliberate or conscious process, but rather the result of the interaction between organisms and their environment. By favoring those individuals with advantageous traits, natural selection drives the evolution of species and shapes the diversity of life on Earth.
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