They change shape due to a number of reasons.
The easiest reason to understand why they change is that they erode.
The coasts around the the world erode due to waves hitting cliffs, the wind batting against the coasts etc. Over a long period of time we can see that they change in shape.
(sorry I don't know why they move)
He said that apothecary was poor, and that if they needed money to sell him the potion to not strave.
I believe the answer of this problem is A. All other answers don't need the hyphen or do. I hope this answer helps you!
