Both stimulants and depressants can be a) inhaled b) injected c) smoked d) all of the above

Both stimulants and depressants can be D. all of the above.

Both stimulants and depressants are addictive drugs; while stimulants generally speed up the body's processes, depressants slow them down. These drugs can be abused and have fatal consequences.

Acourse of medicine

Ican only answer your first question, a machine is like a human body because it's a little similar. they both almost work like the same.