bit
a phoneme
Morpheme
Yes, a phoneme is the smallest unit of sound that can distinguish meaning in a language. Changing a phoneme can result in a different word or meaning.
Morphemes carry meaning, yes. Phonemes do not.
The smallest unit is a quark. I'm not sure what you mean by 'of classification'
If it is a molecular compound, the smallest unit is called a molecule. If it is an ionic compound, the smallest unit is called a formula unit.
Cells.
Alyssa Carney is the smallest unit of mass.
A molecule is a compounds smallest unit
This smallest unit is the atom.
A cell is the smallest unit of an organism
Smallest unit of a compound is a molecule.