Translation is the conversion of O RNA to DNA.
O DNA to RNA.
O DNA to protein.
O RNA to protein.

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.

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.