Environmental Science for AP* (2nd Edition)

Published by W. H. Freeman
ISBN 10: 1464108684
ISBN 13: 978-1-46410-868-6

Chapter 19 - AP Environmental Science Practice Exam - Section 1: Multiple-Choice Questions - Page 698: 2

Answer

(d)

Work Step by Step

Greenhouse gases were not historically present in the atmosphere, because greenhouse gases like $CO_2$, methane, and water vapor have always been present in Earth’s atmosphere, though levels vary over time. The answer is (d).
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