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We do not have free will since everything that happens is determined by what has happened before.
If quantum randomness is real, then everything is not determined by what happened before.
Consciousness is nothing more than a biological computer having enough time on its hands to contemplate its own existence.
We have no proof consciousness is entirely based on a material mecanism. Since we haven't solved the mind-body problem, we can't affirm that kind of statement.
There is no scientific evidence that GMO foods are harmful to humans.
If you think about this study: http://www.mnn.com/green-tech/research-innovations/stories/did-gmo-corn-give-these-mice-giant-tumors , it has been widely criticized for its lack of rigorousness.