There are easy creationist answers to problems evolutionists pose

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Endogenous retroviruses are the remnant DNA of a past viral infection. Retroviruses (like the AIDS virus or HTLV1, which causes a form of leukemia) make a copy of their own viral DNA and insert it into their host's DNA. This is how they take over the cellular machinery of a cell and use it to manufacture new copies of the virus.

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Sometimes, the cell that gets infected by such a virus is an immature egg cell in the ovary of a female animal. Such cells can be stored in a state of suspended animation or dormancy for as much as 50 years before they complete meiosis and become mature egg cells ready to be fertilized. Because they are dormant, gene expression is suppressed and the infection cannot take over the cell and kill it. If that egg later matures and is fertilized, the newborn organism will have that endogenous retrovirus in every one of its cells, and so will all of its descendants.

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Every viral infection is unique. The complete genome of an animal is so huge, and the insertion point of a virus’s DNA is so random that it is statistically impossible for any two individuals to have the same exact endogenous retrovirus in the same exact spot on the genome unless they both inherited it from a common ancestor who had the original infection. And the infection of a germ cell is so rare that ERVs make up only somewhere between 1% and 8% of the entire human genome.

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If two humans have the same identical ERV, it is proof that they are descended from a common ancestor. And if two different species have the identical ERV, it is proof that they too are descended from a common ancestor. In humans, there are about 30,000 different ERVS embedded in each person's DNA. Except for those later duplicated by a duplication mutation, all of them record unique infections of a single ancestral individual. Now here is where it gets really interesting.

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There are at least seven different known instances of shared ERVs between chimps and humans... i.e. ERVs which are the identical viral DNA inserted into the identical spot of the genome. 100% of all chimps and 100% of all humans have these same ERVs. This is only possible if 100% of all chimps and all humans are descended from the single individual that had these original infections.

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They are proof that humans and chimps share a common ancestor.

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In a 2000 paper published in the journal Gene researchers identified ERVS shared by different primates and used them to assemble a family tree of monkeys apes and humans.

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Reference: Lebedev, Y. B., Belonovitch, O. S., Zybrova, N. V, Khil, P. P., Kurdyukov, S. G., Vinogradova, T. V., Hunsmann, G., and Sverdlov, E. D. (2000) "Differences in HERV-K LTR insertions in orthologous loci of humans and great apes." Gene 247: 265-277.

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Human Evolution: Endogenous Retroviruses prove that humans and chimps share a common ancestor.

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