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EEcosystemscosystems
LLessons 3–essons 3– 44
Copyright © by Harcourt, Inc.
All rights reserved. No part of this publication may be reproduced or transmitted in
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Florida 32887-6777. Fax: 407-345-2418.
HARCOURT and the Harcourt Logo are trademarks of Harcourt, Inc., registered in the
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Printed in the United States of America
ISBN-13: 978-0-15-349211-2
ISBN-10: 0-15-349211-2
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Ecosystems
Lessons 3–4
Lesson 3
How Do Natural Cycles Affect Ecosystems? . . . . . .2
Lesson 4
What Roles Do Organisms Play in Biomes? . . . . . 10
Visit The Learning Site!
HHow Doow Do
VOCABULARY NNaturalatural
succession
organic
carbon cycle
nitrogen cycle CCycles Affectycles Affect
EEcosystems?cosystems?
Over time you can see A substance that contains carbon
succession of different plant is organic. These vegetables all
species in an area. Some kinds of contain carbon.
plants come in, others die out.
2
Carbon compounds move
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