Which of the following statements is true? The buildup of carbon dioxide in the atmosphere causes the greenhouse effect.
An increase in pressure causes an increase in reaction rate.
The formation of gas bubbles is an indication of a chemical change.
all of the above

is there an all of them are true option cause it should be that

Explanation:

your answer to your question is all of the above

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.