Answer
None
Work Step by Step
From 400,000 B.C. to 0 A.D the maximum carbon dioxide concentration is 300ppm. The lowest point in the 1980s was at around 330ppm.
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 46 - Data Analysis Activities - Page 837: 2
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