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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

When you speak a word that you have read or heard, the message goes to the parts of your brain concerned ... An illustration of the inside of the human mouth.

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 ...

.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.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 ...

www.quora.com/How-did-humans-start-speaking

It it the necessity of the evolution( Charles Darwin's theory of natural selection ). But then why ... But then why not any other animal but only we humans started speaking ?? Also many animals have vocal cords but why only humans can speak ?

www.bbc.com/earth/story/20150216-can-any-animals-talk-like-humans

Feb 16, 2015 ... Animals as diverse as elephants and parrots can mimic the sounds of human ... Their rapid rhythm precisely matched that of humans speaking.