The digestive system is responsible for digestion. what other jobs does this system complete for the body?

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

The united states uses which source of energy to produce almost 40 percent of its electricity

Jellyfish sometimes squeeze in the sides of their bodies. this pushes a stream of water from the back end of their bodies. according to newton’s third law of motion, how will this behavior affect of the jellyfish ?