Answer:
9
Step-by-step explanation:
The 9 essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.thx.
8
histidine
lsoleucine
lysine
methionine
phenylalanine
threonin
tryptophan
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