Essentials of Biology (5th International Edition)
Essentials of Biology (5th International Edition)
5th Edition
ISBN: 9781259660269
Author: Sylvia S. Mader, Dr., Michael Windelspecht
Publisher: Mcgraw-Hill
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Chapter 19.1, Problem 1CYP
Summary Introduction

To write:

The key events in the evolution of animals.

Introduction:

The early evolved animals are invertebrates that lack skeletal system. These invertebrates evolved into vertebrate animals, which have an endoskeleton. The key events on the evolution of animals are primarily based on the developmental, anatomical, and molecular data.

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Essentials of Biology (5th International Edition)

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