Which book asserted that due to the expanding human population, the ecosystem will collapse by the middle of the twenty-first century? Dennis Meadow’s asserted that due to the expanding human population, the ecosystem will collapse by the middle of the twenty-first century.

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.