Answer :
Environmental elements like diet, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens can all affect which genes in an animal are expressed, which in turn affects the animal's phenotype.
There are two categories of factors that are known to affect phenotypic diversity in a population: genetic and environmental. Sometimes a gene's DNA sequence or level of activity is altered by the environment. Either of these outcomes can alter the proteins that come from a gene, which in turn affects traits. The nucleotide sequence of a gene can be altered by some hazardous environmental factors. For instance, UV radiation has the ability to damage DNA strands.
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