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Humans are unique as the only remaining example of hominid. But there are plenty of fossil evidence for other hominid beside Homo sapiens. If you mean only to include existing species and ignore fossil evidence, I would suggest you note that like all the great apes, we are tailless, we are ambulatory with unique use of the arms compared to other group of animals, we have binocular vision like all primates, we share the same Vitamin C defect in our enzymes with apes, Old and New World monkeys and so on.
Yes human existence has unique chararcteristics of language and bipedal motion, but the evidence in the fossil record indicates the movement from a common ancestor to humans as these traits were selected as advantageous.
As to your allusion to the symbiotic relationship. I tend to agree. Evolution isn't about survival of the fittest but the perpetuation of the combinations of genetic material. As such integration as well as competition offers strategies that can be successful in securing the next generation.
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Even a superstitious man has certain inalienable rights. He has a right to harbor and indulge his imbecilities as long as he pleases. . . He has a right to argue for them as eloquently as he can, in season and out of season. He has a right to teach them to his children. But certainly he has no right to be protected against the free criticism of those who do not hold them. He has no right to demand that they be treated as sacred. He has no right to preach them without challenge." -H.L. Mencken
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