To add: The connecting phrase to separate echinoderms from chordates. Concept introduction: Phylum Chordate which is characterized by the presence of notochord and dorsal nerve cord consists of vertebrates animals. Chordates diverged into two groups: one that consists of cranium or brain box (fishes, reptiles, mammals, and amphibians) and the other that lacks cranium (tunicates, hagfish, and lancelets). Phylum Echinoderms are the aquatic animals that include starfish, sea cucumbers, sea urchin and sand dollars. Echinoderms are characterized by a unique feature of spiny skin which performs the function of defense.

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Chapter 21, Problem 2PIT

Summary Introduction

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The connecting phrase to separate echinoderms from chordates.

Concept introduction:

Phylum Chordate which is characterized by the presence of notochord and dorsal nerve cord consists of vertebrates animals. Chordates diverged into two groups: one that consists of cranium or brain box (fishes, reptiles, mammals, and amphibians) and the other that lacks cranium (tunicates, hagfish, and lancelets). Phylum Echinoderms are the aquatic animals that include starfish, sea cucumbers, sea urchin and sand dollars. Echinoderms are characterized by a unique feature of spiny skin which performs the function of defense.

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