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Defines crustaceans, such as slaters and freshwater crayfishes, and describes their physical characteristics, life cycles, habitats, senses, food and means of self-defense.

Defines echinoderms, such as sand dollars and crown-of-thorns sea stars, and describes their physical characteristics, life cycles, habitats, sense, food, and means of self-defense.

Defines myriapods, such as centipedes and three groups of millipedes, and describes their physical characteristics, life cycles, habitats, senses, food, and means of self-defense.

Defines cephalopods, such as blue-ringed octopuses and giant squids, and describes their physical characteristics, life cycles, habitats, senses, food, and means of self-defense.