Some animals that live in extremely cold environments protect themselves from freezing by increasing the molality of certain chemicals in their cells. Define molality and explain how it protects these animals.

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.