It is all brain chemistry. Just because the physics that cause you to do one thing or another are incredibly more complex than the physics that causes water to go downhill doesn't mean it isn't all just following a bunch of predetermined rules.
To believe in free will is to believe that something exists outside the fundamental rules of physics, that the connection between cause and effect can be severed. Now, most people are perfectly willing to believe such things, but I've seen no evidence to indicate such. Now, I do believe our brain chemistry is such that we have no choice to perceive free choice and can't help but act accordingly.
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