Because of different DNA handed down from their ancestors, and different environmental effects.
Genotype - refers to the genetic characteristics
Genotype examples - intolerance, allergies, ex…
Phenotype - refers to the physical characteristics or they also be measured in a laboratory
Phenotype examples - levels of blood cells, levels of hormones, any physical trait like height, hair color, ex…
Hope this helps some
Answer - Consists of all the individuals of a species that live together in one place at one time.
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