Alien - The Brown Tree Snake Story ...

[ Pobierz całość w formacie PDF ]
Teacher’s Annotated Edition
Informational
Nonfiction
Alien
The Brown Tree Snake Story
by E. C. Hill
Macmillan
/McGraw-Hill
STRATEGIES & SKILLS AT A GLANCE
Read to
Find Out
The brown tree
snake is called
alien, but it is
not from another
planet. Why is
alien a good
adjective for this
snake?
Comprehension
•
Strategy: Summarize
• Skill: Identify Main Idea and
Details
Vocabulary
• alert, lunge, predators, prey,
species, surroundings, survive,
vibrates
Vocabulary Strategy
• Context Clues: Look for
Restatement
Content-Area Vocabulary
Words related to brown tree
snakes
(see glossary)
NATIONAL CONTENT STANDARDS
Science
• Life Science
Word count: 2,088**
photo credits COVER: (bkgd) Michael & Patricia Fogden/CORBIS. : (tc) Michael & Patricia Fogden/
CORBIS. 2–3: (t) Joseph Sohm, ChromoSohm Media, Inc./Photo Researchers, Inc. 5: (c) Michael &
Patricia Fogden/CORBIS. 6: (tc) Robert Meyers/Visuals Unlimited. 8: (b) Keystone/Getty Images. 10:
(b) Michael S. Yamashita/CORBIS. 11: (t) PhotoLink/Getty Images. 13: (tr) Theo Allofs/CORBIS. 14–15:
(bc) John Alcock/Visuals Unlimited. 15: (tr) David T. Roberts/Nature’s Images/Photo Researchers, Inc.
16: (tc) Joseph Van Wormer/Bruce Coleman, Inc. 18: (tl) Michael & Patricia Fogden/CORBIS. 19: (tc)
PhotoLink/Getty Images. 20: (t) James L. Amos/CORBIS.
A
Published by Macmillan/McGraw-Hill, of McGraw-Hill Education, a division of
The McGraw-Hill Companies, Inc., Two Penn Plaza, New York, New York 10121.
Copyright © by Macmillan/McGraw-Hill. All rights reserved. No part of this publication may be
reproduced or distributed in any form or by any means, or stored in a database or retrieval system,
without the prior written consent of The McGraw-Hill Companies, Inc., including, but not limited to,
network storage or transmission, or broadcast for distance learning.
Printed in the United States of America
1 2 3 4 5 6 7 8 9 026 10 09 08 07 06 05
**The total word count is based on words in the running text and headings only.
Numerals and words in captions, labels, diagrams, charts, and sidebars are not included.
Focus Question:
How do things in nature change when something
alien is introduced to an ecosystem? (
How Things Interact with Their
Environment
SC.G.1.2.2.2.5.1 Knows that organisms compete in a
climatic region and adapt to survive)
Alien
The Brown Tree Snake Story
by E. C. Hill
Table of Contents
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Chapter 1
The Brown Tree Snake . . . . . . . . . . . . . . . . . . . . . . 4
Chapter 2
Invading Guam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Chapter 3
A System Out of Balance . . . . . . . . . . . . . . . . . . . 14
Conclusion
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Glossary
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Index
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Comprehension Check . . . . . . . . . . . . . . . . . . . . . . .24
Introduction
Do you have a favorite place in nature? Maybe
you like to hike through a forest. Each time you
go, you see the same plants and trees. You may
see some of the same animals, too.
All these living things share a place to live.
They share that place with nonliving things. The
place they share is called an
ecosystem
.
In an ecosystem some animals eat plants.
Other animals eat weaker, smaller animals. Yet no
one
species
, or kind of animal or plant, has taken
over. Scientists say the forces of nature in that
ecosystem are balanced.
2
Content Vocabulary:
An
ecosystem
includes both the living and
nonliving things in an area and how they interact. Living things include
all the plants and animals. Nonliving things include water, soil, air,
light, and temperature. Everything in an ecosystem is connected and
interdependent.
But sometimes this balance changes. The
weather might grow colder. Or people might
move nearby. And sometimes an alien, or foreign,
species moves in.
We’re going to look at what changed the
balance in one ecosystem. It’s on the island of
Guam (GWAHM). This island is in the Pacific
Ocean. It has a warm, wet climate. Thick forests
cover much of the land. All kinds of birds and
animals live there. They include many kinds
of snakes. One snake, the brown tree snake,
is an alien species. That means it came from
somewhere else. This snake changed the balance
of nature on Guam. Let’s find out how.
3
[ Pobierz całość w formacie PDF ]