Biology 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0078024269
ISBN 13: 978-0-07802-426-9

Chapter 46 - Major Ecosystems of the Biosphere - Assess - Page 903: 1

Answer

b. the tilt of the Earth as it orbits about the sun

Work Step by Step

The earth's spin axis is tilted with respect to its orbital plane. This is what causes the seasons. When the earth's axis points towards the sun, it is summer for that hemisphere. When the earth's axis points away, winter can be expected.
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