1. light waves are one type of wave. mechanical electromagnetic 2. sound is an example of a wave. mechanical electromagnetic 3. a wave requires a medium. mechanical electromagnetic

Which is the best for showing percentages of different types of cars sold(gas hybrid , electric , other ) in the united states ?

We have a colorless transparent liquid. it looks like water. we seperated it into a solid and a liquid by evaporration and condention was this a chemichal or a physical seperation a. chemical seperation b. physical seperation

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve