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is scientific knowledge established through direct observation and remains constant. scientific knowledge can change
when scientists
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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.

fe 55.85 g/mol and h2o 18.02 g/mol.