Which phrase best describes a species

A species is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche.

Explanation:

its correct

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as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.