Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.

which statement correctly identifies the types of macromolecules that are described?
glycogen is a protein, and insulin is a lipid.
glycogen is a lipid, and insulin is a protein.
glycogen is a carbohydrate, and insulin is a lipid.
glycogen is a carbohydrate, and insulin is a protein.

Glycogen is a carbohydrate, and insulin is a protein.

Explanation:

Glycogen is a polysaccharide made of thousands of glucose molecules. This is also called ‘animal starch’. The glucose is stored as glycogen in animal cells and humans. Thus, it is a carbohydrate. Insulin is a hormone secreted by beta cells of islets of Langerhans. It is a polypeptide made of amino acids. Thus, it is a protein.  

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

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