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    Psychology
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    Psychology in Modules
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    Exam 18: Waking and Sleeping Rhythms
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    The Iris Is a Doughnut-Shaped Ring of Muscle That Adjusts
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The Iris Is a Doughnut-Shaped Ring of Muscle That Adjusts

Question 226

Question 226

Multiple Choice

The iris is a doughnut-shaped ring of muscle that adjusts the size of the


A) cochlea.
B) cornea.
C) pupil.
D) lens.

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