Because they are a clear, readable genetic pathway, that follows exactly how you would expect from class to class (class being Birds, Reptiles etc) and within species in each class.Originally Posted by PostmodernProphet
Retro-viruses, as their name suggests, work backwards to normal viruses, from an enzyme to RNA to DNA, this leaves a mark on the code if said retro-virus joins a replicating code (like a sperm cell that goes on to infuse with an egg) then that mark will be on the genetic code of all of that creatures descendants.
Obviously the chances of this happing are tiny, amazingly tiny, the chances of the same code getting into different classes of animals, in exactly the same place in a code billions of letters long is just inconceivable.
UNLESS there is a creator who designed all life to look as if it had evolved in a certain way, and luckily enough that certain way that we discovered with the discovery of ERVs just happened to match exactly all our current predictions in all the different fields of biology.
Also, for anyone who'd like to research ERVs more i'd recommend here - http://www.evolutionarymodel.com/ervs.htm it covers all the bases, and breaks down the process into videos, moving diagrams and groups.
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