What did you think it was before you read this brief Wikipedia article?

Of course it is, and you could say the same with regard to mammalian brains in general. However the divergence starts very early in development (seven weeks) so is very big and very significant. By the time a human is born the brain is very different from a monkey's.

What was the alternative?

There has to be a car analogy for this.

Which is why we think we're the center of the universe.

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Implies intelligent design

I think its rather some mutations that produced more reelin and created the most successful animal in earth's history