Answer
They are "hormones" that are protein-containing substances that play a role in the regulation of cell functions, although it should be noted that this is not their only function
Explanation
Protein is a class of nitrogenous compounds which contains large molecules which compose amino acids. Protein can be sourced from different varieties of food some of them being eggs, beans.seafood and many others.
Proteins can perform many different functions in living cells. One major function, acting as a catalyst for chemical reactions, They have "hormones" that are protein-containing substances that play a role in the regulation of cell. They are also required for regulation of body tissues and organs among other things they perform.
The answer would be, "D", "Scarcity of Resources".
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