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All animals in the Chordate Phylum have backbones. They are also called vertebrates.. The Chordate Phylum is split into Classes. Several Classes are listed below:
Looking at this Tree of Life, biologists realized that phyla are deep branches where at the very beginning of the branch ancestral organisms developed a fundamentally new and different body plan. They concluded that all the descendants of this ancestor, living and extinct, form a group that can be called a Phylum.