Why do I catch feelings so easily : /

Because you feel a lot, and that's ok hun.

Explanation:

We can't control our feelings, so don't stress about it. You're not alone <3

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.