How many different amino acids are found in humans?

Nine amino acids

hope it helps!

9

On the other hand, essential amino acids are required in the human diet as they cannot be synthesized by the body. There are nine essential amino acids including histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

well, since there is no answer choices, i will give an answer on how it works : )

the two objects are placed together. energy will always be transferred from the hotter object to the cooler object until they are equal. hope this is close to one of the answer choices : )