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In biological terms humans are sometimes described as highly evolved primates because of the similarities in the physical and biological structures of the bodies of humans and modern primates such as monkeys, apes, orang-utans, gorillas and similar animals, in addition to humans perceived superiority over those primates.

Human and chimp DNA is so similar because the two species are so closely related. Humans, chimps and bonobos descended from a single ancestor species that lived six or seven million years ago.

Apes and Humans, for example, share over 99% of their genes. That means the difference between our species is less than 1% of our genes. In fact, all life on Earth shares about 50% of it's genes. but in the original posting (before someone edited it) I chose to use the word DNA instead of genes.