Which substance is a mixture? Table salt, gasoline, aluminum, carbon dioxide?

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Acontrol during an experiment. might change remains constant does not exist does change

Is a chemical message sent by another individual.