Answer
Oxygen
Work Step by Step
Oxygen is higher on the y-axis than carbon dioxide is when the time period is "today." Therefore, oxygen is more abundant.
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 19 - Data Analysis Activities - Page 317: 3
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