Write a paragraph in your own words describing the process of cellular respiration. Be sure to include the following terms: plant, animal, mitochondria, glucose, oxygen, carbon dioxide, water and ATP

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.