Receiving an organ off a person in the street as you put it, is totally different. I am not talking about tissue match to help with immune system issues (rejection). I am talking about arterial mapping, pressures, muscle thickness etc. Are you trying to say that a chimp heart would work properly in a human and anatomically be easy to install?
Are you saying that if chimps and humans share a common ancestor that their hearts should be exactly the same size and identical in every way?
You do realize that evolution is CHANGE through time, correct? So how does citing differences disprove evolution when differences is exactly what evolution is said to produce?
Am I saying that if Chimps and Humans came from a common ancestor, that I believe they would be identical in every way? Well of course not, but I would expect far more commonalities.
Why?
Look at the ancestors of Wolves, Dogs. Now they have the same eyes, inner ears, skin, the fur is the same, the bone density is the same, their organs are the same.
Could you transplant a chihuahua heart into an adult Great Dane and expect the Great Dane to survive?
Also, wolves and domesticated dogs diverged only 100,000 years ago, or even more recently. Chimps and humans diverged 5 to 7 million years ago which is 50 to 70 times further back in history.
So, with Chimps and humans coming from a common ancestor AND being VERY closely genetically matched, I would expect to see at least ONE commonality.
Using your definitions, I could argue that there is not a single commonality between any two humans. You count any deviation as a lack of commonality. Since every person is different, none of them have a single commonality.
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