Virus <span>is a non-cellular particle made up of genetic material and protein that can invade living cells. </span>
Let’s take butterflies for an example.
Some butterflies change into different colours depending on the environment.
A tree camouflaged butterfly would not survive in a grass camouflaged butter. The reason they survive is because of genetic variation.
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The answer to this question is: 4.543 billion years old
