Hi
how are you doing
how was ur day
f. r.e. e p. o.i. n.t. s
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Hi no day is good for me until this pandemic corona and lockdown ends-_+

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.