c) A simple way to disprove this Innateness Hypothesis, as linguists call it, is to demonstrate that other species have the capacity to speak but for some reason simply have not developed speech.
e) A logical candidate for such a species is the chimpanzee, which shares 98.4% of the human genetic code.
a) Chimpanzees cannot speak because, unlike humans, their vocal cords are located higher in their throats and cannot be controlled as well as human vocal cords.
d) It does not follow from their lack of speech, however, that chimpanzees are incapable of language, that is a human-like grammar.
b) Perhaps they can acquire grammar and speak if they could only use grammar some way other than with a voice.
