Answer
C.
Work Step by Step
C. is correct since these two kinds of secondary xylem are distinguished by their color, darker for heartwood and lighter for sapwood.
Campbell Biology (11th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0-13409-341-0
ISBN 13:
978-0-13409-341-3
Chapter 35 - Test Your Understanding - Level 1 - Knowledge/Comprehension - Page 781: 3
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