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The halaan or  more popularly known as the clam and the tridanca both come from the class of bivalvia, veneroida order and from the veneridae family . On the other hand, the giant african snail is classified under gastropoda, order achatinoidea and from the family of achatanidae.
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Tnx Dhil... nka sagot agad aq for few Minutes sa teacher ko n d nia nllman pinag ggwa ko.. I mean wla.. haha tnx