Recognize the of amino acids.

I feel like you're neglecting to add something, but here are the 22 amino acids:

Alanine, arginine, asparagine, aspartic acid, cysteine, glutamic acid, glutamine, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tryptophan,  tyrosine,  valine, selenocysteine, pyrrolysine

The eight main ones that are essential for us are histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan and valine

rain is the best answer

a- all cells come from pre-existing cells