Which of the following statements is true? the greater the density of a substance, the more it will refract light. the greater the number of photons, the brighter and more intense the light. light is created by vibrations in electric and magnetic fields. all of the above.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."

the answer is:  

line graphs show patterns in data with variables that change over time; whereas, circle graphs show data as parts out of a whole (such as out of 100%).