The opening in the center of the iris is the:
a. pupil
b. retina
c. lens
d. conjunctiva
a
Explanation:
a. pupil: correct
b. retina: is the inner layer of the eyeball
c. lens: is the transparent structure lying behind the iris and the pupil
d. conjunctiva: is the mucous membrane that protects the anterior surface of the eyeball
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