This title is suitable for ages 6 to 10 years. Over 98 per cent of Earth's animals are invertebrates. Invertebrates do not have backbones or internal skeletons, but some have hard coverings. Insects, spiders, worms, snails, and most ocean animals are invertebrates.

 

This book is part of a book series called Big Science Ideas .

There are 32 pages in this book. This book was published 2009 by Crabtree Publishing Co, Canada .