Why do species exist in nature in the form of populations?

A population – an elementary structure of a species – is a collection of freely interbreeding individuals of a given species, living for a long time in a certain area of ​​the species range. Within a population, the frequency of interbreeding of individuals is much higher than between populations.
Living conditions in different areas of the species range may vary slightly. Under the influence of this, in certain populations, properties that distinguish them from each other can arise and accumulate. As among organisms, it is impossible to find two completely identical among populations. The variability of populations increases the internal diversity of the species, its resistance to local (local) changes in living conditions, allows it to penetrate and gain a foothold in new habitats. It can be said that existence in the form of a population enriches a species, ensures its integrity and preservation of the main species properties.

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