CHAPTER 4
LESSON
2
READING TOOL Main Idea and Details As you read your textbook, identify the
main ideas and details or evidence that support the main ideas. Use the lesson
headings to organize the main ideas and details. Record your work in the table.
Two examples are entered for you.
Food Chains
Heading
Food Chains and Food Webs
Energy Flow in Ecosystems
Food Webs
• Food Chains Within Food Webs
• Decomposers and
Detritivores in Food Webs
Food Webs and Disturbance
Ecological Pyramids
Pyramids of Energy
Pyramids of Biomass Numbers
4 Chapter 4 Ecosystems
Main Idea
A food chain shows how
energy transfers through
feeding relationships.
Details/Evidence
On average, about 10% of the
energy is transferred from one
trophic level to the next.
Copyright © by Savvas Learning Company LLC. All Rights Reserved.