The _______________ regulates directly the amount of light that enters the eye.
 |
lens; |
 |
fovea; |
 |
pupil; |
 |
iris; |
 |
both c and d are correct; |
INCORRECT - The pupil does regulate the amount of light entering the eye, but there is a better answer to this question.
[Review Part 1 of the tutorial] [Review Part 2 (Matching) of the tutorial]