Question

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Pentamerous

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Porcupine

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Dome

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Toothpick

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Question

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Feet

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Mouth

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Nose

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Spine

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Because the eggs make great omlettes

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Because a sea urchin's egg is relatively big

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Because sea urchins have large numbers of relatively big eggs

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Because sea urchins have large numbers of eggs

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Question

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Intertidal area only

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On the beach

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Subtidal area only

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Both intertidal area and subtidal areas

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Question

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Small fish

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Other sea urchins

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Sea cucumbers

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Algae

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Strongylocentrotus

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Echinoderms

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Purpuratus

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Animalia

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