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its closed due to the fact tht it is needed to protect against bad bacteria flow

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βˆ™ 12y ago
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βˆ™ 7mo ago

Clams have an open circulatory system. Their blood is pumped by a heart into large sinuses through which it bathes the organs directly before being returned to the heart.

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βˆ™ 15y ago

Daorlita Doyle

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Q: Is a clams circulation open or closed?
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