Sellect all of the answers that are correct. Why is the statement "mRNA might change human DNA" a false statement?
-The mRNA will be chopped up by enzymes in the cell.
-Any person that makes this statemtn does not understand the basics of biology.
- The enzymes required for this to occur do not exist inside human cells.

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.