Giraffes are so tall that when they bend down to drink, a special valve has to stop blood from rushing to there brain and destroying it. If evolution is true and/or works the commonly accepted way, than the first giraffe to get talller would end up exploding, thus not passing on its genes. Explain that, Darwin!
2007-02-02 11:55:12 · 29 answers · asked by goatman 5 in Society & Culture ➔ Religion & Spirituality
Was that supposed to be serious?
I literally laughed out loud at that "explain that, Darwin!". Oh, man that's funny...heh....
2007-02-02 11:58:08 · answer #1 · answered by Zhukov 4 · 9⤊ 1⤋
Evolution is a very slow process. A giraffe with a long neck did not just magically pop out of a horse with a short neck. As this animal began to evolve a longer neck, a new mutation arose - that would be the valve. The giraffes that had this valve were more likely to survive. That would be an adaptation. Some time after the valve arose, a giraffe that had the valve was born with an even longer neck than the first ones. Now this guy could reach the higher branches and eat lots of food, and was more "fit" for the environment, therefore it had offspring. These offspring had the valve and the long neck.
You see, the animals that grew a long neck but had no valve would have died, therefore you do not see long necked giraffes without the valve.
I hope you are getting the picture.
2007-02-02 20:06:50 · answer #2 · answered by citrus punch 4 · 3⤊ 0⤋
"If evolution is true and/or works the commonly accepted way, than the first giraffe to get taller would end up exploding, thus not passing on its genes"
I wouldn't go as far as to say explode, but guess what you are correct!.
Which is exactly why the giraffes were restricted from getting taller until the valve had evolved. Once the genes existed to allow the valve to form the giraffe was "free" to grow taller.
The valve ALLOWED the giraffe to evolve taller.
Btw, Darwin is dead.
2007-02-02 20:14:22 · answer #3 · answered by Anonymous · 1⤊ 0⤋
Yup, and in addition there is a special net of elastic blood vessels at the base of the brain of the giraffe.
These features of the species could well have been selected for over time. I don't think that what you think is the 'commonly accepted way' is the way it actually works.
Partial valves would have been useful for reducing blood pressure to a degree. An intermediate heart would have produced enough pressure for a shorter neck. A smaller net of blood vessels in the head could have handled the lesser pressure. As longer necks were selected for, all of the other components would have been modified bit by bit as well. In other words, for each inch that the neck grew, the giraffe's physiology would have evolved to support such growth before the next inch of neck growth.
Fun fact: Darwin answered this question way back in 1868
Darwin, Charles, 1868. Variation of Animals and Plants Under Domestication, vol. 2, chpt. 20. London: John Murray.
http://darwin-online.org.uk/contents.html#books
2007-02-02 20:09:22 · answer #4 · answered by Anonymous · 2⤊ 0⤋
Those giraffes without the valve would explode, thus leaving only those with the valve (from genetic mutation) to survive. After a while all you'd have are ones with a valve.
2007-02-02 20:07:32 · answer #5 · answered by oenophiliac 2 · 1⤊ 0⤋
So the first giraffe that got that tall happened over night? Wow. By that logic, how many did your god explode before including the valve?
2007-02-02 20:18:25 · answer #6 · answered by Anonymous · 2⤊ 0⤋
Im not atheist, but believe that there is evolution to an extent, not as far as from single cell to human, god created animals etc, but adaptions of animals is possible.
With the giraffes, they wouldnt suddenly get huge necks, it would be a couple of cenimeters at a time. the problem of blood rushing would then start and a second adaption to have this valve would occur.
Personally i believe in creation, but adaptions can occur
2007-02-02 20:04:33 · answer #7 · answered by Anonymous · 1⤊ 0⤋
You are looking at it as a binary effect. The valve would have evolved with the neck because there are detrimental effects short of having your head explode. When the neck was mid-range, they would have passed out.
Also you are looking at the current morphological state and assuming that behavior (such as kneeling) could not compensate along the way.
2007-02-02 20:02:16 · answer #8 · answered by mullah robertson 4 · 2⤊ 0⤋
Maybe the Giraffes had that valve before they before they evolved the long necks. Or perhaps they drunk water from waterfalls as tall as they are.
2007-02-04 00:46:08 · answer #9 · answered by jetthrustpy 4 · 2⤊ 0⤋
I hope you are joking...
Evolution doesn't work that way dumbass. There wasn't just one day a really tall giraffe after years and years of short ones. Evolution is gradual, nit wit. Go back to science class and this time stay awake! GEEZ!!!
2007-02-02 20:02:27 · answer #10 · answered by DontPanic 7 · 5⤊ 0⤋
Did you know that goats have a special valve that stops blood from going to their brains when men are around them?
2007-02-02 20:01:54 · answer #11 · answered by S K 7 · 1⤊ 0⤋