Question

which statement best describes both insulin and glucagon?
they both provide structural support, but only insulin is a carbohydrate.
they both store energy, but only glucagon is a carbohydrate.
they are both hormones that regulate blood - sugar levels.
they are both hormones that help fight disease.

Explanation:

Insulin and glucagon are hormones. Insulin lowers blood - sugar levels by promoting glucose uptake into cells. Glucagon raises blood - sugar levels by stimulating the liver to release stored glucose. So, they both regulate blood - sugar levels.
Neither insulin nor glucagon provides structural support. They are not carbohydrates (carbohydrates include sugars like glucose, fructose, and polysaccharides like starch and cellulose). Also, they do not help fight disease; that is the role of the immune system (e.g., antibodies, white blood cells).

Answer:

They are both hormones that regulate blood - sugar levels.