Science Notebook - Student Edition

Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.

Mammals 305

Mammals

Before You Read

Before you read the chapter, respond to these statements.

1. Write an A if you agree with the statement.


2. Write a D if you disagree with the statement.

Mammals are one of the most successful groups of animals on Earth. Think about a specific

mammal and some of its characteristics. Write about how you think some of these

characteristics help the mammal to survive and be successful.

Science Journal

Before You Read Mammals After You Read

• If an animal has hair, it is a mammal.


• Mammals produce their body heat
  internally.


• A duck-billed platypus is not a true
  mammal because it lays eggs.


• The first mammals probably evolved
  from reptiles.