Which of the following statements presents a testable hypothesis? (a) more people watch basketball games than nhl games. (b) nascar is a popular sport in the southeastern states. (c) calcium is an essential nutrient for our bones. (d) if there is a relation between the wavelength of light and the photosynthesis rate, then light of different colors will cause the plant to make different amounts of oxygen. (e) newton's law of gravitation explains the force that holds the solar system together.

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?