Which part of an amino acid gives it its unique properties?.

Below:

Explanation:

The side chain of an amino acid is what gives the amino acid its unique chemical properties. All 20 naturally occurring amino acids are different from one another in the atoms that compose the side chain, which gives individual amino acids their unique chemical properties.

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in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".