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It certianly can. it just requires a mutation the opposite of the one causing the first evolutionary step.
That would be evolution. If chimps changed over the next few million years to a four-legged creature that cat’s would find a nice mouthful it would be by evolution.
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Of corse not. What they mean by reverse evolution, is that there is no selectiononal pressure requiering organisms to 'stay ahead' and therefore there is nothing holding them from getting a mutation that puts them back to where they were before. They would be just as able to survive with or without the good mutation, and therefore they wont be selectioned against, and therefore survive.
If there is no selectional pressure to 'stay ahead', then a species will barely evolve at all. Crocodiles for example evolved during the dinosaur-era, their environment has barely changed since then meaning they have no pressures that would result in certain mutation getting the edge and spreading throughout the species over the generations to eventually become new races, and eventually species. As such modern day Crocodiles are very similar to those of 65 million years ago, they have no because of lack of pressure to ‘stay ahead’ changed.
Even the reverse evolution is impossible, what a species has evolved from is gone, in past, over… they can’t return to that form. They can only evolve. The environment might well favour genes which make them appear more like something they looked a few stages back, but it wouldn’t be that species they were, it would be a new one simply formed by the same evolutionary pressures (like how Dingo’s and wolves look the same even though, Dingo’s aren’t related at all to wolves, both species were simply evolved by the same environmental pressures). Reverse evolution/ de-evolution is the process of back-tracking down the evolutionary chain, but it’s universally accepted in biology that evolution can only go forward not back.
What these people should be saying is that evolution might have favoured mutations which resulted in Homo erectus evolving into something hairy that may have looked more like our common ancestor which came out of the African forests 3 million years ago, but it cannot de-evolve into that same species which is what reverse-evolution implies.
Can I also point out evolution doesn’t mean becoming ‘superior’ or necessarily ‘better’, only adaptation. From our prospective a larger animal might be more impressive than a smaller animal. But if the smaller size leads to better survival in the wild, then evolution will favour that smaller size even if by human-perspective that smaller size looks less impressive.
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reverse evolution is very rare. i myself do not bleive in bigfoot however i do belive in the yeti. nor do i belive in nessie all of my belifs are based on actualy scientific evidence i have gained since becoming a zoologist
Personally I think there is more evidence for Bigfoot’s existence given the number of sightings over the last few hundred years and that the forests it lives in has already proven itself to have enough food to sustain another large mammal species i.e. bears. The Himalayas may be able to support snow leopards and bears because they live on the lower slopes, but I’m not so sure it has enough food to support apes as well. That said, I’d like to believe in it.
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Reverse evolution very rarely happens...and is truly not "reverse"...It's just a coincedence of gaining the same feature/ability that was lost before..
I’d say even less than rare. But yes, its just evolution only were the new traits taken up by the species are similar to those their ancestors may have, but its still evolution. Humans might well become more hairy in a future ice age, but it doesn’t mean the hair is evidence of back-tracking to an earlier form. De-evolution and reverse-evolution is a myth, its always Evolution.