<meta http-equiv="refresh" content="1; url=/nojavascript/"> Invertebrates | CK-12 Foundation
Dismiss
Skip Navigation
You are reading an older version of this FlexBook® textbook: CK-12 Biology Concepts Go to the latest version.

Chapter 11: Invertebrates

Created by: CK-12

Introduction

Why does not having a backbone make things so complex?

Invertebrates could be described as simple animals. And though some are very simple, the vastness of the invertebrate species makes this group of animals anything but simple.

Chapter Outline

Chapter Summary

Summary

Invertebrates describes eight invertebrate phyla with the greatest number of species. From the simple sponge to the echinodermata, this diverse group of organisms is anything but simple. Essentially, the only common characteristic among all the groups is the lack of a backbone. Many people may not even recognize the sponge as an animal. But it is. And how many people think a worm is an insect? But it is not. Add to this group all the different species of insects, and the diverseness of this group is easily apparent.

Image Attributions

Description

Difficulty Level:

At Grade

Categories:

Grades:

Date Created:

Feb 24, 2012

Last Modified:

Apr 29, 2014
Files can only be attached to the latest version of None
Please wait...
Please wait...
Image Detail
Sizes: Medium | Original
 
CK.SCI.ENG.SE.1.CK-12-Concept-Biology.11

Original text