Definition: Carbon

Carbon: "The fourth most abundant element in the universe, and always present in organic material, carbon is the basic building block of all known life". (Wikipedia) [en.wikipedia.org]

Virtually every form of life is comprised of carbon compounds. You may remember from science fiction shows like "Star Trek"; aliens love to refer to human beings as "carbon units". This entertainment reference is based on fact, so sometimes even Hollywood science fiction can draw on reality for inspiration.
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