o_iv >> By the way, I read an interesting article on the subject, and what if there was copper instead of iron in hemoglobin?
It turned out: 1. The blood would be blue. 2nd For the normal functioning of this blood, a sufficiently high level of alcohol in the blood is required. Three It starts working normally at pressures below those that are about a kilometer above sea level :-)
It turns out the direct Greek pantheon - the blood is blue, live in the mountains, constantly drink :-)