I think the most accepted Theory to make up living things is the cell theory.
It’s D, cognitive. Cognitive development has to do with the mind.
Insulin (secreted from the pancreas)
Oversecretion: hypoglycemia (low level of sugar in the blood)
Undersecreation: hyperglycemia (high level of sugar in blood, Diabetes Mellitus)
Vestigial because they don't use it but it's still there
Answer:
I am not certain but I think carbohydrate
