Evolution is driven by natural selection, where beneficial mutations (such as color changes that improve camouflage) increase an organism's fitness by improving survival and reproduction, causing advantageous traits to become more common in populations over generations while poorly adapted species are selected against.
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Evolution is the process that shapes all life on Earth through genetic changes, natural selection, a本站添加:
Mutations might seem like a bad thing, but actually they can also be neutral or even beneficial. For example, a species of yellow grasshoppers might mutate and become green, which makes them blend in with the grass and get eaten less. Over time, you can expect to see more and more green grasshoppers as their fitness has increased. Not that kind of fitness, fitness as in they can have more offspring because they get eaten less.
This is natural selection and the driving factor behind evolution as the poorly adapted species gets selected against and the fittest species, which has adapted to the environment, survives and has the most offspring passing down the trait that made them survive.
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