“At the molecular level, we are all virtually identical.”

— Carl Sagan

The Varieties of Scientific Experience: A Personal View of the Search for God (2006)
Context: When you look more generally at life on Earth, you find that it is all the same kind of life.... It uses about fifty fundamental biological building blocks, organic molecules.... with trivial exceptions, all organisms on Earth use... an enzyme, to control the rate and direction of the chemistry of life.... a nucleic acid to encode the hereditary information... the identical code book for translating nucleic acid language into protein language.... At the molecular level, we are all virtually identical.

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American astrophysicist, cosmologist, author and science ed… 1934–1996

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“At the molecular level, we are all virtually identical.”

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