Why is charcoal black? question options: charcoal has a black-colored pigment. charcoal reflects black-colored light. charcoal absorbs all wavelengths of light that fall on it. charcoal reflects all wavelengths of light that fall on it.

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.