Answer:
Taxonomy. Quick google search. :)
Explanation:
Answer:
A. Cell
B. Organ
C. Tissue
Explanation:
cell: The smallest unit of life capable of independent reproduction. Generally contains nucleic acid, cytoplasm, a cell membrane, and many other proteins and structures.
organ: A structure made of different tissues that work together to perform physiological functions.
Tissues: A group of similar cells with the same origin that work together to perform the same function.
Answer: Option A.
Explanation: The correct answer to the question is option A, because not all proteins are made up of some combination of 20 essential amino acids.