Personally, it is outrageous. If my ability is just as equal of someone else of a different color or wealthier then me, I should be given an equal chance. The world isn't fair but when it comes to thing like this, it should be. People of lower class can work just as hard as higher class, no one really takes that into consideration.
The organisms who do better at surviving and reproducing will pass on more genes than those who don't. So those with better adaptations will survive more to pass on those genes.
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I think peripheral nervous system!!