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B
Pila
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C
Trionyx
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D
Equisetum
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Solution
The correct option is ATeredo Teredo or the shipworm is a species of saltwater clam. It is a marine bivalve mollusc. At the anterior end, it has a small shell of two valves, which is specialised to bore wood. At the front end, there are two triangular calcareous plates. The animal uses them to grasp wood and slowly enlarges the burrow in which it lives.