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Soz wade - none of the above.....
Its to counter the extra fatigue that the aircraft experience due to continually being in motion (ie going up and down) on the carrier. The movement causes the wings to flex and suffer from fatigue, which land based harriers dont suffer from (to the same extent), thus they need the extra material, and thus the extra weight!
Lesson over for the day!!!  
Isnt it great to know that after 3.5 years of studying aerospace engineering i know this sort of shit!! Its just got to increase your confidence in flying doesnt it??   
Would you like me to start telling you some of the dodgy shit we get up to in aircraft now???   
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Never hold your farts in!!!
They travel up your spine into your brain
and that where you get shit ideas from!!!
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