How can air pollution affect plants? A. Air pollution can block sunlight from reaching plants.

B. Air pollution can affect the water plants need.

C. Air pollution absorbs carbon dioxide.

D. Air pollution can change normal temperatures of a region.

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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.

answer; 4 electrons;