Biology 2010 Student Edition

Published by Prentice Hall
ISBN 10: 9780133669510
ISBN 13: 978-0-13366-951-0

Chapter 3, The Biosphere - 3.2 - Energy, Producers, and Consumers - 3.2 Assessment - Page 72: 1a

Answer

Two primary sources of energy are solar energy and chemical energy.

Work Step by Step

Solar energy and chemical energy can be used by living things as sources of energy. Primary producers use these types of energy to convert inorganic compounds into food sources.
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