Assertion: mussel's shell | /r/HasProperty | identical
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text: This means that they have two identical shells that cover and protect them and they feed by consuming plankton and other microscopic organisms from the huge amounts of water that they filter every day (10 - 20 gallons).Due to the way that mussels feed, it is vital that the mussel population is not depleted from our rivers or streams, as without them our waters would not be as clean.