How many centimeters are in 4 inches?

A) 4000

B) 40

C) 400

D) 4

(Note: I think the answer is 4000)

By the end of this lab, you will see how some materials diffuse through a semipermeable membrane but others do not. The materials that you examine will differ in molecule size. Some will be larger and some smaller. Formulate an investigative question for this situation.

10.16 is the answer

I'm not sure so ...