Which two facts about plastic affect the environment in a negative way? there are many kinds of plastics to choose from. some plastics release toxic chemicals. they’re good insulators. they don’t break down over time.

Which statement best describes the superposition principle? a.) if two in-phase waves arrive simultaneously at a point, their amplitudes add up b.) if two out-of-phase waves arrive simultaneously at a point, their amplitudes add up c.) if two in-phase waves arrive at a point one after another, their amplitudes add up d.) if two out-of-phase waves arrive at a point one after another, their amplitudes adds up