You are not certain whether these two peaks are singlets arising from uncoupled protons at different chemical shifts or are two peaks of a doublet that arises from protons coupling with a single adjacent proton. What simple experiment would you perform to distinguish between these two possibilities

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.

it means there are 3 atoms of oxygen