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Mussels shells are made of calcium carbonate

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Mussels produce waste

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Mussels have a mouth

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Mussels hold water inside their shell when the tide goes out

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The colour of the food they eat can change the colour of their shell

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Mussels are a mollusc

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Mussels have attachment threads that help them attach to rocks

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Mussels are a bivalve - meaning it has two shells attached by a hinge

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Mussels are an invertebrate which means it does not have a backbone

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Mussels grow their own shells

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If a mussel has a white sac it is a male

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Mussels have gills that filter the plankton out of the water

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The abductor muscles open and close the mussels shell

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Mussels have muscles called abductor muscles.

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Mussels have rings on the shell that show how old it is

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When the tide comes in the mussel opens and when the tide goes out they close

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Mussels are made of the same minerals as fingernails

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Mussels have a foot

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If a mussel has an orange sac on the inside it is a female