Why are comets unlikely to be able to support life? a. a comet's environment is not stable. b. a comet does not have an atmosphere. c. a comet does not have a reliable energy source. d. all of these

Why do lunar and solar eclipse not happen every month

Harry lives in a city, and he has a lung condition known as asthma. on certain days, harry has to stay inside because pollutants in the air make it difficult for him to breathe. which of these pollution sources are nonpoint sources that might bother harry if he goes outside? choose the two that apply.

Who determined the nature of chemical bonds?