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what coefficients would be needed to balance the following chemical equation? put them in order separated by commas. if no coefficient is needed, put a 1. example: 1,2,3,4

a) 2, 1, 1
b) 1, 2, 1
c) 1, 1, 2
d) no coefficients needed

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.