What symbol is used to indicate that a note is flatted?

Niels Bohr

A. established the quantum theory of radiation. B. proved that the Newtonian system was still valid. C. explained the behavior of electrons at the subatomic level. D. discovered X-rays.

According to the Roman poet Virgil, the Romans trace their origins to the

a. Spartans. b. Egyptians. c. Trojans. d. Etruscans.