There are twenty amino acids in living organisms. Ten of these are referred to as essential amino acids. Why are they called essential amino acids?
These amino acids are the only ones that are important for the body to function properly.
These amino acids cannot be made by the human body and must be consumed in one's diet.
These amino acids are the only ones that are made by the human body.
O
DONEV

It is “These amino acids cannot be made by the human body and must be consumed by one’s diet.”

Explanation:

A healthy body can produce non-essential amino acids by itself, while we need to acquire the essential amino acids via our diet to be healthy.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

i don't know. if i were you, i would search it up online : d