Material Flashlight A Flashlight B
Were the effects
the same or different?
Liquid
crystal
paper
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Plastic
stars
Beads
Seroll for more

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.

answerca air mass;