Answer
a.
Work Step by Step
In low-light conditions, a spoke-like iris muscle surrounding the pupils contracts, allowing the pupils to dilate to let in more light.
Biology: The Unity and Diversity of Life (14th Edition)
by Starr, Cecie; Taggart, Ralph; Evers, Christine; Starr, Lisa
Published by
Brooks/Cole Publishing Co.
ISBN 10:
1305073959
ISBN 13:
978-1-30507-395-1
Chapter 33 - Self-Quiz - Page 579: 14
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