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I never said it was only possible to have language if one has vocal chords.
What I am saying is there is no evidence whatsoever that dinosaurs had language.
many birds (mynah, ravens, parrots) can "speak words" but they are not using those words as language, more of a phonetic pronunciation.
one can go threough life without language. it is possible to learn survival skills, and to co-exist in group dynamic without language, just sounds and gestures. humans and pre-humans and apes and monkeys and such would have and still do live like this.
for a sound symbol system to be language it has to be able to accomdate new ideas and new words and new concepts whether concrete or abstract.
gestures and grunts do not accomplish this.
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