Why would a semi-colon versus a period be needed in a sentence?

In the franz kafka’s the metamorphosis after gregory turns into a giant insect he realizes his sister grete can’t stand to look at him. he hides from his sister and stays under a bedsheet.what does this act suggest about gregor?

Sitting near the front of the classroom

What effect does the revelation of nachiketas's reception of shraddaha in part ii have upon the reader's perception of the unfolding story?