[gleeaikin]

Millions of viruses in the sea.

The genetic material from lower life forms in the sea probably got into the human genome via our ancestors the amphibians who probably got when they were still in the sea and passed it on to us.

[muawiyah]

That's one hypothesis. How about the last mosquito bite you ran into? How do you know some virus inserted into your bloodstream didn't make it's way to your gonads?

Did you ever notice that all the mammals and birds who had ancestors living in the trees have full color vision?

Yup, it's a fact.

Did you ever wonder how such an amazing feat of parallel evolution took place?