Why do species exist in the form of populations?

The species consists of a large number of individuals. These individuals are settled in a certain territory. Environmental conditions in this territory can vary greatly (there may be areas that are not at all suitable for the life of the species, barriers dividing populations). Each particular combination of environmental factors needs its own adaptations, so populations of the same species may differ from each other. If the species existed in indivisible form, it could only live in a certain small territory and would disappear when environmental conditions change. Thus, species exist in the form of populations because:
1) This allows you to make fuller use of available resources (occupy a large territory, etc.)
2) It helps the mind to better adapt to environmental conditions.
3) This contributes to the independent accumulation of changes within the species, which increases biodiversity
4) Increases the likelihood of survival of the species (if suddenly the environmental conditions change dramatically, then some populations may have a sign that will help the species survive).

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