It is the Iris I believe. It controls the diameter and size of the pupil, controlling the amount of light reaching the retina.
1.44 solar masses :) you are welcome
1. <span>Rain occurs when water vapor condenses
</span><span>2. The best term to use to describe turning from a liquid to a gas is </span><span>vaporization
</span><span>3. When you add heat energy to a liquid it turns into a gas</span>
