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Makes great sense.. the only problem is...
and I must have lent my article out to someone...

from memory here we go... okay. the giraffe starts out with a short neck.. can't reach tall trees for food.. okay... somehow selective breeding favours the longer necked giraffes.. so in a few generations the information for shorter necks is gone, and the longer ones are there.. excellent.. that is going to get you a few inches tops...
if you continue with your growing neck idea... you need a special type of heart, a heart that is different than that of a short necked giraffe. It needs to be able to pump blood up an extra lets say 4 feet.... Also, a giraffe drinks water by tipping its neck/head forward, and down to the water... this will not work with a normal neck.. You need special valves through out your neck, that would allow you to lower your head, and not have your heart pump with the same amount of force, because it would blow your head up! Secondly...
The short necked, and short+ necked giraffe could breath fine, but the + 4 foot neck giraffe, unless his lungs, and his airways and passages are modified with special lubricant releasing "machines" would get so severly wind burned that he would die! These are just two of the problems with the neck growth theory. I am talking however about two different types of growth.. the growth that I first talked about is in the genetic code, it is there, and just not in every one. So natural selection will get ride of the shorter necked giraffe and leave you with the SLIGHTLY longer neck. However, then somehow.. using a yet unknown method, the giraffe's genetic code for a neck changes, but so does their heart, and their lungs, and their airways, all at the same time, to give this animal its survival advantage. This.. according to darwin himself... dissproves his theory... he states that if two things had to simultaniously evolve, to give something an advantage, then it can't be!