What is considered the most advanced animal phyla?

a. Chordata
b. Echinodermata
c. Mollusca
d. Arthropoda


ANS: A
Chordata is the most advanced phylum. The animals in this phylum have a rigid notochord, hallow
dorsal nerve system, and gill slits at some point in their development. Information can be found in the
section Construction of Complex Chordate Bodies Begins on a Stiffening Scaffold

Environmental & Atmospheric Sciences

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