Are pickles a type of a fruit

Technically, pickles may be considered both a fruit and a vegetable. While they are made from cucumbers, which are a vegetable, the U.S. Supreme Court ruled them a ‘fruit of the vine’ because of their seeds.

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.