He should raise his hand and wait for a teacher
Answer:
Cell is the basic , functional unit of life
An atom is the smallest unit of ordinary matter that forms a chemical element .
They either eat other organisms, or they produce their own food..
The answer is D. Proteins.
As enzymes are considered to be globular proteins, made up of amino acids linked together in one or more polypeptide chain, to which this as a whole is a protein.
