Newton's law of universal gravitation, the law of conservation of mass, the law of superposition, and the laws of thermodynamics are all examples of scientific laws because a. they have been approved and accepted by congress. b. there are no exceptions to these laws under specific stated conditions. c. they have been modified repeatedly over time. d. they are found in science textbooks.

The answer is B. there are no exceptions to these laws under specific stated conditions.

Explanation:

These laws are a set of facts, which affirms a constant relationship between several variables and factors which have gone through observations and that have been experienced, interpreted and are considered as demonstrated, that is, the hypothesis of these laws has been demonstrated through experiments.

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.