Nerves are responsible for carrying electrical signals throughout the body and towards the brain. They are predominantly used for communication between body parts.
The retina is responsible for triggering these nerve impulses.
The pupil is a hole in the iris. Its main function is to allow light into the eye.
The iris controls the size of the pupil in order to maintain the correct amount of light entering the eye.
It was the belief that it was destiny for the Caucasians to expand and to take over North America. This caused conflicts when the Caucasians wanted to take land from the native Americans.
