Answer :
The expression of an animal's genes ultimately determines its phenotype, which is influenced by environmental factors like as nutrition, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens.
Because of alterations in the environment, as well as the physiological and morphological changes brought on by ageing, an individual's phenotype may change continuously throughout their lifetime. As the availability of food, for example, affects size, different environments can both change the expression of similar genotypes and impact how inherited features develop (for example, twins maturing in dissimilar families). Natural selection, which initially affects individuals and favors the survival of those creatures with phenotypes most adapted to their existing settings, is based on the effect of the environment in nature.
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