Will a reaction of matter stays the same during a physical change

In what ways does a cell function like a small city or factory

In areas where even the experts disagree; everyone has a right to his own opinion. i mean if answers aren’t given just like in lots of things; then it has to be just anyone’s opinion. is this dualism multiplicity relativism or commitment

Most of the written music that has been preserved from the middle ages is a. sacred. b. for flute and guitar. c. polyphonic. d. dance music.