Question

Explain how human beings are able to speak

Answer 1

because of the tongue and larynx (the voice box) human can speak....

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Answer 2

Not only do humans have evolved brains that process and produce language and syntax, but we also can make a range of sounds and tones that we use to form hundreds of thousands of words. To make these sounds -- and talk -- humans use the same basic apparatus that chimps have: lungs, throat, voice box, tongue and lips