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Human speech is produced when air pushed out of the lungs passes over the vocal folds in the larynx. This causes the vocal folds to vibrate, which creates sound.
The muscles in the larynx can adjust the length and tension of the vocal folds, which changes the pitch of the voice. Differences in the shape and length of vocal folds from person to person causes their voices to sound different from one another.

en.wikipedia.org/wiki/Human_voice

The human voice consists of sound made by a human being using the vocal folds for talking, ... Generally speaking, the mechanism for generating the human voice can be subdivided into three parts; the lungs, the vocal folds within the larynx, ...

www.npr.org/templates/story/story.php?storyId=129083762

Aug 11, 2010 ... But unlike chimps, humans have a vocal tract that allows us to do ... more efficiently — all to further our ability to make more sounds and speak.

www.sciencemuseum.org.uk/whoami/findoutmore/yourbrain/whatisspecialabouthumanlanguage/howdoesyourbraincontrollanguage/howdoyouspeak

How do drugs affect your brain? How does your brain grow? What is special about human language? How does your ... How many languages can you speak ?

www.ask.com/youtube?q=How+Do+Humans+Speak%3F&v=RKvAF1QvWq0
May 24, 2016 ... http://www.revelationtv.com Most of us do it every day without even thinking about it, yet talking is a uniquely human ability. Not only do humans ...

www.entnet.org/content/how-voice-works

But just as we walk without thinking about it, we usually speak without thinking how our ... We can compare these structures to those of a horn or trumpet. ... is changed by the shape of the resonator tract to produce our unique human sound.

www.theatlantic.com/business/archive/2015/06/why-humans-speak-language-origins/396635

Jun 24, 2015 ... Why We Speak. An evolutionary biologist argues that humans started talking because they needed to negotiate. Lauren Giordano / The Atlantic ...

www.scientificamerican.com/article/why-do-human-beings-speak-so-many-languages

Jul 17, 2017 ... Language diversity has played a key role in shaping the history of our species, yet we know surprisingly little about the factors shaping this ...

www.businessinsider.com/why-do-humans-speak-so-many-languages-2015-11

Nov 10, 2015 ... Scientists may have discovered why humans speak so many different languages ... To do this, they compared sound and language data with ...

www.mpi.nl/q-a/questions-and-answers/why-cant-apes-speak

Unlike humans, apes lack the anatomical pre-requisites for verbal language ... Another reason why apes cannot speak is because they lack the cognitive ...