Respuesta :
I think the best way to explain is that cells have their own uniqueness that is not just uniformity in every organism but also all of it may somewhat came from a single cell and that is how the 1000 of these gene are present on both the the two organisms
All eukaryotic species came from a common ancestor.
Millions of years ago, there were a meteorites fall that almost kills all living organisms on Earth, only a few survive and those evolve into all species as we know them now.
And this is why into DNA code, you can find similar parts or sequences of genes in a lot of different species.