Which question is the best scientific question? Why does a duck eat?
Does a duck like what it eats?
Should people eat duck?
What does a duck eat most often?

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