| An advantagous gene only increases the CHANCE of survival, if a the first human with claws happened to get hit by a rock and died before reproduction, there goes a wasted good gene. Many useful traits may have not made it, and many not so useful traits may have managed to survive.
What if a human developes a very useful trait and a bad trait at the same time? If the good one is good enough, the bad one might get a free ride into our gene pool.
Also, we developed from monkeys supposedly in Africa, so it would be very helpful to get rid off all that hair, and I'm pretty sure bugs are also a big problem around there.
Btw, hair, claws, fangs, etc all take energy to make, wether it means staying longer in the womb or eating more a day, nothing is free. Our minds take a shitload of energy to make and use. Its pretty much our only asset and we're already the species that takes the longest in the womb, and it takes us several years after that to finish developing outside the womb (hey all you ladies, carrying a kid for 9 months is hard, but if we worked like other animals, it would take 5 or so years and a lot of stretching to get a human baby out).
Perhaps evolution did away with many benefital traits so that we could develope the brain in a relatively moderate time, and not have to eat an elephant a day. |