What occurs when a solid substance dissolves into a liquid? A. It stays solid and floats on the top of the liquid substance.

B. It changes the liquid substance into a solid substance.

C. It breaks down and becomes part of the liquid substance.

D. It stays solid and sinks to the bottom of the liquid substance.

It stays solid and sinks to the bottom of the liquid substance.

answer; protein;

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.