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to compare two animals as a whole

lets say
1) human
2) rat

you cant put genomes of both onto a computer and make a comparison from first genetic markers to the last and everything in between, to check if human and rat are 50% the same, or 80% or whatever

its not possible because human genome is like 4 gigabytes and rat is similar size

these are too big for computer software!
of course it might be fault of programmers, who knows

what is possible to do, is to compare mitocholdria of a human and a rat and those would reveal to be 99% identical to no surprise

both human and rat evolved from primitive rodents 80 million years ago, altough a human had several ape stages in between:
1) flying monkey (lives on trees)
2) macaque (lives on ground)
3) something that resembles chimpanzee a lot more, has lost its tail
4) finally human at some point

a rat evolved from squirrel much more directly