I want to take a common animal like the giraffe. The giraffe stands 19 feet tall, and has a heart 2 feet long in order to pump the blood up it's long neck, producing a blood pressure in excess of 200psi. The problem occurs when the giraffe has to lower it's head in order to take a drink. Without an elaborate series of valves in the giraffes neck, everytime the giraffe lowered it's neck, the pressure would be so great, the blood vessels would burst. Could anyone explain to me how these valves developed gradually over long periods of time using evolution.
Personally, I believe that God created the giraffe with fully functioning valves. But those of you who believe in evolution, how would you explain the evolutionary development of those valve. Like I said, if those valves aren't fully functioning, everytime the giraffe lowered it's head, it would die. And I want to point out one other fact: Dead giraffes can't evolve.
Any evolutionary theories out there?
2006-12-12
16:37:54
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28 answers
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asked by
ted.nardo
4