Generate a topic word for the given sentence. A topic word is usually the name of a person, place, animal, concept or object the sentence is focusing on.

"flower power" was a 1960s slogan, used by hippies and other people who were against war and violence.
flower power

a detritivore (also known as decomposers) is an animal that feeds on dead organisms (living things) and breaks them down into smaller molecules.
detritivore

barium sulfate is a chemical compound composed of barium and sulfate ions.

barium sulfate