O uso do álcool como combustível é: Apa) mais caro que o diesel;
b) menos inflamável e mais caro que a gasolina;
c) mais caro que a gasolina;
d) menos inflamável e menos tóxicos que a gasolina e o diesel.

idk

explanation:

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.

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