[overgard]

Evolution and adding complexity aren't the same thing. For example, evolution can also work in reducing complexity. Animals that spend generations living underground in caves will lose their eye sight over a long enough time period.

Point being its not about adding, it's about adapting

[timmaxw]

In _this_ case, the case of the human brain, I think it's fair to say that evolution started with the reptile brain and added something (even if that "something" is "new function and complexity" rather than "a completely new physical structure").

I agree there are other cases where evolution removes/simplifies things. Evolution is adaptation, and that adaptation can consist of adding, changing, and/or removing.