The answer to this question would be nine amino acid.
Essential amino acid is the amino acid that can't be produced by a human, so it needs to be fulfilled by their diet. There are 9 essential amino acid which was phenylalanine, methionine, leucine, valine, threonine, tryptophan, isoleucine, lysine, and histidine But there are 6 conditionally essential amino acid that the synthesize might no be enough in some condition, so it will be needed in the diet too.
Natural selection favors G6PD deficiency as compared to malaria is the best way to explain that the parasite that causes malaria doesn't survive well in G6PD-deficient cells.
