Question

question 8
evidence shows that chimpanzees and humans share 98% of the same dna sequences. what does this evidence show about the evolution of humans and chimpanzees?
it shows that humans and chimpanzees shared a common ancestor within the last 10 millions years.
it is just a coincidence and does not show anything about the evolution of these species.
it shows that humans were chimpanzees until they evolved 2%.
it shows that humans and chimpanzees must live in similar environments and have evolved to become more similar.

Explanation:

DNA is genetic material. Similar DNA sequences suggest a close evolutionary relationship. A common ancestor is a key concept in evolution. If two species share a high percentage of DNA, it implies they diverged from a common ancestor relatively recently. Option 2 is incorrect as such a high DNA - sharing percentage is not a coincidence. Option 3 is wrong because humans did not "be chimpanzees" before evolving. Option 4 is incorrect as the high DNA - sharing percentage is more about a common ancestor than similar environments (though environment can play a role in evolution, the DNA evidence points more to a common ancestor).

Answer:

It shows that humans and chimpanzees shared a common ancestor within the last 10 millions years.