The biggest shell?
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The biggest are giant clams, Tridacna gigas. Their twinned shells can grow to well over a metre across and tip the scales at 200kg, the same as two newborn elephants.

The biggest are giant clams, Tridacna gigas. Their twinned shells can grow to well over a metre across and tip the scales at 200kg, the same as two newborn elephants. Giant clams, like all shell-making molluscs, sculpt their protective homes from calcium carbonate and gradually expand them throughout their lives.

Explanation:

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