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Invertebrates #2

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Across
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Starfish are part of this group
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Measures over 15 feet across
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Study of biology of insects
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Feeding pincers
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One of insects' segments
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Branches into tube feet
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Largest group of arthropod
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Gills extract oxygen from this
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An organism in the phylum Mollusca
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An invertebrate chordate
Down
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Body segment formed by fusion of head and main body
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A function of tube feet in starfish
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Back pair shields non-flying insect
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Centipedes and insects are found here
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Has over 2,000 suction cups
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An example of a chelicerate
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Hard calcium carbonate cover
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Has 3 pairs of legs
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Characteristic of an echinoderm
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500,000 species