1. Echinoderms are the only invertebrate group of   ______ . Echinoderm comes from echino-, meaning "spiny," and -derm, meaning "skin." Most echinoderms have some type of spine embedded in their skin. For some species, such as the sea urchin, these spines are very large, but for other species, such as the starfish, these spines may be very small. protostomes  deuterostomes acoelomates  2. Like all starfish, the crown-of-thorns starfish is ____. spirally  bilaterally  radially

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Animal Phylogeny

Cladistics is a method of biological classification where organisms are classified based on their ancestors and their relationship with them. It is defined as the concepts and methods for determining the branching patterns of evolution and evolutionary history. Some scientists, however, have preferred the term phylogenetic systematics or phylogenetic taxonomy to emphasize the reliance on a phylogeny for classification. It is the most common and accepted method for classifying organisms.