A term often used to describe the frequency of a sound is?

In positive numbers less than 1, the zeros between the decimal point and a non-zero number are blank significant

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

The air that we breath is made mostly of which gaseous molecule