Answer
C.
Work Step by Step
The thymus is a primary lymphoid organ.
Biology 12th Edition
by Mader, Sylvia; Windelspecht, Michael
Published by
McGraw-Hill Education
ISBN 10:
0078024269
ISBN 13:
978-0-07802-426-9
Chapter 33 - The Lymphatic and Immune Systems - Assess - Page 639: 5
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