The statement "Glycogen is a carbohydrate, and insulin is a protein" correctly identifies the types of macromolecules that are described. Thus, the correct option is D.
The main function of glycogen is to control the release of glucose into the blood when the condition is glucose deficient. It is the liver that directly contributes to the release of glucose into the blood.
Insulin is a hormone that is made up of amino acids, hence it is a small protein that contains almost all structural features of proteins.
Glycogen is a complex carbohydrate that can easily and rapidly coverts the form of glucose into energy.
Therefore, the correct option for this question is D.
To learn more about Insulin, refer to the link:
https://brainly.com/question/786474
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