At standard pressure, the difference between the freezing point and the boiling point of water, in kelvin degrees, is d. 373 a. 100 b. 180 c. 273

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.

answerleaving cheese out to get moldy;