Corrected entry: Apes do not possess the physical capacity for human speech. Their vocal chords are simply incapable of it, no matter how intelligent they become.

Correction: In the first movie in this franchise, Caesar spoke after he was exposed to the updated ALZ-113 drug. It is shown that this drug causes a physical side effect in humans when we see a doctor sneeze blood after he was exposed to the drug. Since this drug causes physical changes in humans, it is not unlikely that it could also cause a physical change in apes as well, allowing Caesar and other exposed apes to speak.


Maybe the drug only affects humans physically. Ape anatomy is different from humans, so it's not unreasonable that the drug only physically affects humans but not apes, and that the drug only affects apes mentally.

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