Simplicity is when you can see what your focusing on. Here you can see perfectly what the main subject is. There is nothing else around it just plain background.

Lines is when lines direct you to whats the main thing of the picture. On here you can see how the lines point down & direct you on looking at the person.

Balance is when it is symmetrical or when on one side theres darkness and on the other there is light where it focuses on the subject. I chose this picture because you can see on the sides its dark and then in the middle there is light which is the main subject.

The rule of thirds is when the main subject is not in the middle. Its more to the right or left. On this photo the subject is the man at the bottom. You can see how he is not in the middle but more to the bottom left.

Framing is when the subject is in the middle. I picked this photo because you can see how the subject is   in the middle. The subject which is the buildings are the only thing you can see but still are in the middle.

Mergers is when something or someone from a picture is cut off. Maybe it not a complete picture.
I picked this picture because on the left side the firefighter has part of his arm cut off and I don't know if there is another firefighter next to him.