Answer:
Tertiary.
Explanation:
Primary structure of proteins refers to the order of amino acids that make up the protein. The heme is an nonprotein non-amino acid, so it is not involved at this stage.
Tertiary structure of proteins is the overall 3-D folding of the protein (it comes after secondary, which involves folding into a repeated pattern). The heme bonds to its correct position on the hemoglobin during this stage and helps in correct folding.
People, coal, and gasoline are sources of CO2
I took the test the answer (for sure) is c: programmed cell death. Good Luck!
MASS: because it is the measure of the amount of matter in an object
