1. What part of the body should we closely relate aperture? our eyes.

2. the smaller the Aperture larger the f-number the higher the Aperture the smaller the lens. 

3. In your own words tell me how aperture impacts Depth of Field? A large f-number will bring all foreground and background objects in focus, while a small f-number will isolate the foreground from the background by making the foreground objects sharp and the background blurry.