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In fact most of our DNA is junk code from other organisms. Mainly viruses

Hey, baby, wanna do the horizontal gene transfer?

Aren't we made of a bunch of different microorganisms also? We aren't even fully human.. we were the aliens all along!

Is it actually “junk” or possibly something we can’t detect it’s use due to lack of technology?

same with dark matter I think

Depends on what you mean

It’s junk. Nonsense codons. They don’t code for anything and are just artifacts of specific types of viruses that integrate into our genome. They actually are a great history book that scientists use to mark time points in human evolution.

This is true of all animals and fish though - so if we're aliens then so are every other animals

That’s completely fascinating.