The four largest classes of mollusks and their habitat. Concept introduction: Mollusks are the group of organism included in the sub kingdom eumetazoa. Mollusks have bilateral symmetry and contain three germ layers. Mollusks come under the class lophotrochozoa. They have soft and unsegmented bodies. The first opening in the embryo of mollusk results in mouth, which placed it in class protostomes.

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Chapter 21.5, Problem 2MC

Summary Introduction

To determine:

The four largest classes of mollusks and their habitat.

Concept introduction:

Mollusks are the group of organism included in the sub kingdom eumetazoa. Mollusks have bilateral symmetry and contain three germ layers. Mollusks come under the class lophotrochozoa. They have soft and unsegmented bodies. The first opening in the embryo of mollusk results in mouth, which placed it in class protostomes.

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