Yes it is true squids and scallops both use jets of water to propel themselves forward. however, they have different ancestors
The phylum Mollusca, which comprises snails, sea slugs, octopuses, squid, clams, mussels, and oysters, includes scallops. Bivalves are a class of mollusca that includes scallops. Squids and scallops have same ancestors but later show divergent form of evolution and develop into two different groups from the same ancestor.
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