The iris is the colored part of your eye. what is the main function of your iris?
a) muscles in the iris direct light waves to the back of our eyes.
b) muscles in the iris trigger a response that protect our eyes.
c) muscles in the iris control the amount of light that enters the eye.
d) the iris is responsible for refracting light to focus the images we see

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem