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Animal Life Structures

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Across
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An animal with a backbone
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Having one or more colors to allow an organism to blend in
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An animal without a backbone
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Specific group of vertebrates that feed milk to their young, have hair or fur and breathe air with lungs
Down
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structure or behavior that helps a living thing survive
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A hard outside covering found on some invertebrates
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A wide variety of living things
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a group of vertebrates that usually start life in the water and move to land