Which phrase describes a hypothesis? a. reviewing information related to the problem b. testing a factor, or variable, in an experiment c. suggesting a solution to a problem after studying it carefully d. performing a controlled experiment

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.

idk what the question is about

it's c (engineer's do their work with mechanical stuff not on any living being)

answerspecific gravity;