2. Processes move carbon from one form to another. Which of the following is a process? O A. Vegetation
O B. Rock formation
O C. Coal, oil and gas​

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.

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

answerlinnaeus;