In my opinion the discovery of the true concept of species and life. I am a biology student and I have always questioned the fact that there is no clear concept of what a species is and what life is. Recently the concept of species was considered as members of populations that reproduce or can reproduce among themselves in the wild and not according to a similar appearance and that their decency is fertile, however they were found in a Siberian cave the remains of a woman with Denisovan genome and a Neandentalis, two different species of ancient hominids, this in my opinion revolted this concept.
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