How do enzymes speed up chemical reactions?

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Ascientist wants to determine the effect of a new type of gasoline. he fillsone car with normal gasoline and another identical car with the new gasoline. which is the control group? a. the new type of gasolineb. the car with the normal gasolinec. the car with the new gasolinethe amount of gasoline usedd. the amount of gasoline used

(99 points) be serious! how do farts work? how do you fart without it stinking? serious answers only