A pair of scientists proposes two different theories to explain the same set of observations. Which of the following best explains the value of these competing theories? 1 Competing theories can be a source of new, testable ideas. 2Competing theories are necessary to transform a theory into a law. 3Competing theories generate controversy that helps popularize ideas. 4Competing theories allow scientists to combine the most interesting aspects of both theories.

The midpoints? a, b, and c are marked on the histogram. match them to the indicated scores. which? scores, if? any, would be considered? unusual?

The material that keeps its new shape after it is stretched is called?

With the simplified model of the eye, what corrective lens (specified by focal length as measured in air) would be needed to enable a person underwater to focus an infinitely distant object? (be careful-the focal length of a lens underwater is not the same as in air! assume that the corrective lens has a refractive index of 1.62 and that the lens is used in eyeglasses, not goggles, so there is water on both sides of the lens. assume that the eyeglasses are 1.90