Which statement is true according to the quantum model of the atom? when an electron drops down from a high energy level to a lower one, light energy is emitted. when an electron jumps up from a low energy level to a higher one, light energy is emitted. every orbit around the nucleus of an atom is the same energy level. after they emit light, electrons are sucked into the nucleus of the atom.

i think it would be b. tissue because an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.