How does light travel?
a. light only travels in a vacuum and travels faster when the sound is moving
b. light on only travels in a medium and light travels faster when a sound source is stationary
c. light can travel in a vacuum in the speed varies depending on whether the source is moving or stationary
d. light can travel in the air or a vacuum and the speed is constant weather the light source is stationary or moving

Which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea. c. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. d. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated.