(B) Phylum-$Mollusca$ is the second largest phylum of animals.These organisms are triploblastic,meaning they possess three germ layers (ectoderm,mesod

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(B) Phylum-$Mollusca$ is the second largest phylum of animals.These organisms are triploblastic,meaning they possess three germ layers (ectoderm,mesoderm,and endoderm).They are coelomate,meaning they possess a true body cavity lined by mesoderm.They exhibit an organ-system level of body organization.