Why is the DNA of a human so similar to the DNA of a chimpanzee?
A) Although humans and chimpanzees have different ancestors, they faced the same environmental challenges and, therefore, evolved in similar ways.
B) Chimpanzees evolved as a result of the hybridization of Neandertals and the ancestors of modern humans.
C) Since all organisms evolved from the same original life form, they all have essentially the same DNA. The 1 percent difference in DNA sequences that exists between all organisms is responsible for the diversity of life on Earth.
D) Humans and chimpanzees share a very recent common ancestor.
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