Do cells come in different shapes and sizes ?

Yes, cells come in all shapes and sizes.

Explanation:

Cells are of different shape,size and structure according to the function they needs to perform,  each cells do different things.

The answer is D. Hearing these words from his mother made Gregor realise that the lack of any direct human communication, along with the monotonous life led by the family during these two months, must have made him confused — he could think of no other way of explaining to himself why he had seriously wanted his room emptied out.