I will give Brainliest

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?

Which macromolecule catalyzes chemical reactions this be considered enzyme chemical reactions thus he considering enzymes

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?