Indicate whether the structures in each of the following pairs are enantiomers, diastereomers, or identical molecules. (a)

Indicate whether the structures in each of the following pairs are enantiomers, diastereomers, or identical molecules.

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(a) (b) HO₂C- H₂C- H₂N- OH H OH CH3 -CH3 -CO,H -CO,H HO₂C- НО- HO₂C- CH3 CH3 H -OH -CO,H -NH₂ CH3