Humans have died from bullets and being cute or stabbed by swords for millions of years, why has our skin not adapted to be hard enough to protect us from these things? Isn't that the point of adaptation? T make a species better fit for survival?
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Unlike an omnipotent deity, evolution can’t envision some ending point and work towards it despite intermediate steps that lower fitness. Evolution must also deal with trade-offs, such that an advantage in one situation may prove disadvantageous in others.
For instance, when hominids were first evolving to fight with tools like knives and clubs, there may have been humans with slightly tougher skin and humans with slightly better eye-hand coordination. Against a club or knife, slightly tougher skin would not be expected to help very much. Slightly better coordination would likely have proven much more useful, as that would allow the possessor to make better attacks and parries, thus avoiding much more damage. Accordingly, we are much more dextrous than other apes, but our skin is not tougher.
For instance, when hominids were first evolving to fight with tools like knives and clubs, there may have been humans with slightly tougher skin and humans with slightly better eye-hand coordination. Against a club or knife, slightly tougher skin would not be expected to help very much. Slightly better coordination would likely have proven much more useful, as that would allow the possessor to make better attacks and parries, thus avoiding much more damage. Accordingly, we are much more dextrous than other apes, but our skin is not tougher.
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First of all it takes WAY longer for evolution to happen than the time frame you are thinking. Just because humans have died from something doesn't mean they have adapted.
For evolution to occur there has to be a consistent selective pressure acting on en ENTIRE population. Your statement is like saying ... because people have drowned why haven't we grown gills. Most people don't drown and that doesn't affect your ability to reproduce. Lets say the entire world became a water world and only good swimmers survived. It would effective EVERYONE so the bad swimmers would die and not reproduce. Good swimmers would live and have kids (pass on their genes). It would lead to new populations of better swimmers.
For evolution to occur there has to be a consistent selective pressure acting on en ENTIRE population. Your statement is like saying ... because people have drowned why haven't we grown gills. Most people don't drown and that doesn't affect your ability to reproduce. Lets say the entire world became a water world and only good swimmers survived. It would effective EVERYONE so the bad swimmers would die and not reproduce. Good swimmers would live and have kids (pass on their genes). It would lead to new populations of better swimmers.
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Theres no such thing as adaption