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)
Writing process stage which involves looking through the written draft for problems with minor details like punctuation and capitalization is D. Proofreading.
Proofreading is that stage of writing wherein, after editing the proofreading is done in order to blemish the minor details (before the final print) that may have escaped our attention like punctuation and capitalization.
Answer:
first one is right answer .
9, 18, and 27 are three numbers that have a GCF of 9