Genetically speaking, humans have roughly 10,000 differences from other mammals – mostly related to brain development. This might sound like a lot, but the human genome is about 3 billion base pairs, so we’re only 0.003% different from other members of Class Mammalia.
For this reason, it shouldn’t be surprising that chimps and humans are 99% alike, house cats and humans are 90% alike, mice and humans are 85% alike, and cattle and humans are 80% alike.
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