What different types of atoms make up glucose

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

The following hormone had their receptors in the cell membrane except a-insulin b-tsh c-gh d- cortisol

Explain why the plants cortex would serve as the best food source for animals