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1) shells of molluscs and
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crabs
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free ride - mobility for the
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cnidarian
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protection - both symbionts
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camouflage - host
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2) Fish
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3) Photosynthetic symbionts
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live inside mesoglea
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(30,000/mm2)
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Zoochlorellae - green algae
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Zooxanthelae - dinoflagellates
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