For an ape to become a man theoretically he must mutate only 1 % of DNA. At first you might not think this is very significant, remember the mutations have to be exactly the order of human person. It is estimated that for 1% difference only one million mutations are needed. How can one have a million mutations with each mutation in the direct order to make a human. Impossible !!!
Example of only 5 mutations George Simpson , an ardent evolutionist estimated to get five mutations in the exact order it would take 10,000,000,000,000,000,000,000 chances.
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The mutations originally happened by chance, but stayed and prospered due to a survival benefit. So those 5 mutations that are very rare didn't have to be the exact 5. The process of determining which change would happened started randomly, and then stayed because of a benefit like I said. We could have evolved in some other beneficial way with the same process. The important part is the random changes that STAY are ALWAYS due to a survival advantage. We could have ended up many ways though, and you are right that the odds of us turning out the EXACT way that we have is extremely, extremely~~ unlikely. The odds of us developing in other another environmentally advantage creature from our common ape ancestor is the exactly the same percentage as the the odds of us being what we are presently (10,000,000,000,000,000,000,000 according to you).
So evolution doesn't have to follow an exact path. Evolution is randomness combined with capitalizing on the randomness. The odds of us evolving from single celled organisms billions of years ago would probably keep a super computer busy for a lifetime.
To answer your title question, there are many species that have stayed around even though another creature evolved from them. I'll give an example. All mammals in the ocean are mostly believed to evolve from a creature similar to a wolf (I forget exactly) that was very low to the ground like an alligator. It lived near the shore mostly and went in and out of the ocean. At some point enough a change occurred to where the animal was able to completely live in the ocean. I'm not sure what exactly happened with that animal but it's possible for both species to exist because they would still be designed to have advantages in each habitat. It's technically possible for two different species to exist and compete in the exact habit like lions and hyenas but that's another topic. Both the wolf-alligator like mammal could exist along with the slightly different fully aquatic animal.0
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