How are musical instruments grouped?
by the wavelengths they produce
by how they produce pitch
by what they are made of
by their frequency

How have the competing explanations' experiments on atoms affected the development of the atomic model?

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d

Suppose a comet has an orbital period of 309.1 years around the sun. what is it’s average distance from the sun?