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Across 1. small openings along the anterior part of the gut 5. the outer covering of sea squirts 6. a long, compact bundle of neurons that is part of the central nervous system 7. the mouth of tunicates

Down 1. a tail that extends beyond the anus; 2. the secondary opening on a tunicate with expels water from the gut 3. a series of articulating bones surrounding the nerve cord of vertebrates; a spinal column 4. a flexible rod that lies below the nerve cord of chordates