Answer Answer Answer Answer

A

Explanation:

The carrot itself was made up of the same chemical bonds and chemicals even when it was cut but it was cut affecting the form/shape

In chemical changes, the object undergoes a change where the chemicals themselves undergo a change

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.