A retrovirus is actually a virus that encode the DNA anddestroys the DNA and replace it with RNA. As I heard on TV they presume that life on planet (when it started out was actually beginning of earth) when the monkey have the retrovirus they made the thing call humans and about 99% of the a regular human. Without this retrovirus you won't be living, breathing, mammals. I hope u got some of the info! =)
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