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" ... It’s well known that when ocean water freezes, impurities become concentrated in the sea-ice. However, Levi notes that it’s this very concentration effect that is so important for driving reactions that can produce matter of biological interest, such as amino acids. The process of thawing and refreezing over and over again, says Levi, enables molecules to mix and chemically react, not unlike the effect of combining test tubes of organic sludge here on Earth. ... "