Habitat loss, natural catastrophes, and/or excessive harvesting of a species often result in:

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Habitat loss, natural catastrophes, and excessive harvesting can reduce the size of a population to a point where only a few individuals remain (population bottleneck). This can reduce genetic diversity, increase the frequency of harmful alleles, and limit the ability of the population to adapt to changing environmental conditions.

Habitat Loss, Natural Catastrophes, And/or Excessive Harvesting of a Species