Aperture, Shutter Speed, ISO

1. What part of the body should we closely relate aperture?
The pupil of the eye

2. The smaller the Aperture the larger f-stop, the higher the Aperture the smaller f-stop

3. In your own words tell me how aperture impacts Depth of Field?
The  larger the aperture is, then the smaller the area will be in focus, depth in field.

Photo of F2.8 aperture.

Photo at F16 aperture.

High Shutter Speed

Slow Shutter Speed