i have a friend, who is relatively well educated, and definitely takes science and mathematics seriously. we were talking awhile ago, and he made the statement that: "given enough time, and the fact that people are becoming increasingly inactive, leading sedentary lives - eventually humans will evolve to have no legs". as though, our lifestyle affects our DNA with such magnitude, as to rewrite our physical form. i took the opportunity to explain that evolution is nothing without evolutionary pressure. that some outside force that makes one mutation advantageous specifically to the point that it allows it's holder to spread it's DNA more abundantly, is necessary. a few days ago someone posited that a civilization billions of years older than us would necessarily be billions of years "more" evolved. now maybe someone with a better understanding can correct me ( i hope not ) but that's simply not true, is it? from my understanding, that pressure is 100% necessary, without it evolution grinds to a halt. we are already evolved enough that we have almost no evolutionary pressure. And therefore, short of an extinction event, are unlikely to evolve biologically, naturally. sorry so long, what's the consensus?