Rutherford's experiment showed that subatomic particles
a. are the same size and shape as the atom.
b. don't take up most of the space in an atom.
c. all have similar sizes and characteristics.
d. do not influence the behavior of an atom.

b

explanation:

mitosis

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.