Humans are beings of nature. After we are born how much we change our features through medicines, plastic surgery, wheelchairs, crutches etc. we are still created through the combination of the male and female DNA. Every time that a sperm meets and egg there is variation that occurs and makes that new life special. We all have unique combinations of DNA and are all vessels through which new traits can arise. No we do not allow the weak to die as they would in a less technological society. We have people with traits that would be undesirable in the 'wild' but we can still overcome it. Maybe this is making us more susceptible than were we to allow nature to kill off people with traits that are not useful in traditional sense but we have brought ourselves up on this pedestal so as long as we have the technology we will try and save every life we can.
Evolution still happens whenever there is an exchange of genetic material to create a new life. Until we are able to create life without the help of organic genetic material we will be subject to evolution. It may be different from Darwin's perspective of evolution but it is still happening. Evolution is a very slow process and many suggest we are drawing from the same pool of genes as our ancestors were, dating back to just before the agricultural revolution.
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