Order Now Free Trial

About Science A-Z

Resources
- Instructional Units
- Life
  GRADES K-2
  GRADES 3-4
  GRADES 5-6
- Earth & Space
  GRADES K-2
  GRADES 3-4
  GRADES 5-6
- Physical
  GRADES K-2
  - Doing Work
  - Energy
  - Light
  - Properties
  - Magnets
  - Things Move
  GRADES 3-4
  GRADES 5-6
- Process
  GRADES K-2 Tools
  Skills
  GRADES 3-4 Tools
  Skills
  GRADES 5-6 Tools
  Skills
- Resource Types
- Science & Literacy
  Books
  Additional Reading
  Comprehension Supports
  Vocabulary
  Assignable Digital Resources
- Activities
  Hands-On Activities
  - Process Activities
  - Science Fair Resources
  Scientific Argumentation
  - Debates
  Project-Based Learning
  - Project-Based Learning Packs
  Multimedia
  - Science Videos
  - New Interactive Science Lessons
  Assignable Digital Resources
- NewNGSS
  Grade K
  Grade 1
  Grade 2
  Grade 3
  Grade 4
  Grade 5
  Grades K-2 Engineering
  - Engineering Design
  Grades 3-5 Engineering
  - Engineering Design
  Middle School Resources

Manage Students
Manage science activity and growth
- View your entire roster.
- Make assignments.
- Track progress with reports.
- Review what's in your In Basket.
Teacher Corner

Standards and Correlations
Next Generation Science Standards

U.S. State Science Standards

International Science Standards

STEM Connections

Common Core - ELA/Literacy

FOSS Module Correlations

Gizmos

Leveling
Science A-Z Reading Levels

Professional Development
Live Webinars

Recorded Webinars

Video Library

Instructional Tools
Projectables

Helpful Tips

Student Connections
Get Students Started

eBooks

Incentives & Awards

Mobile Apps

Kids Login

Reading Levels These books contain three developmentally appropriate reading levels for each grade span.

Low
Mid
High

Each level of the book conveys similar concepts, images, and vocabulary.

Invertebrates

© Zoonar RF/Zoonar/Thinkstock

Invertebrates

Invertebrates are animals that do not have a spine. While students may be more familiar with vertebrates, it is the invertebrate group that represents over 95 percent of all animals on Earth. This unit explores six groups of invertebrates: poriferans (sponges), cnidarians (e.g., sea jellies and corals), echinoderms (e.g., sea urchins and sea stars), mollusks (e.g., octopuses, snails, and clams), annelids (worms), and arthropods (e.g., insects, spiders, and crustaceans). All invertebrates share several traits, but there is also amazing diversity among invertebrate groups. (For vertebrates resources, find the Vertebrates unit in the Life Sciences domain.)

Overview Resources

Book Assembly

Single-Sided

Download Instructions

Double-Sided

Download Instructions

Sign up to receive our eNews, updates, and offers.

Subscribe You may unsubscribe at any time.

/ / / /

Connect with us on Facebook

Follow Us on Twitter

Watch Us on You Tube

© 2018 LAZEL, Inc. All rights reserved. Learning A-Z, Headsprout, Raz-Kids, and Science A-Z are registered trademarks of LAZEL, Inc. Reading A-Z, ReadyTest A-Z, Vocabulary A-Z, and Writing A-Z are trademarks of LAZEL, Inc. Other trademarks, logos, and service marks used in this site are the property of LAZEL, Inc. or third parties.