(A) The class $Osteichthyes$ (bony fishes) includes both marine and freshwater fishes. In contrast,$Chondrichthyes$ (cartilaginous fishes) are primari

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(A) The class $Osteichthyes$ (bony fishes) includes both marine and freshwater fishes. In contrast,$Chondrichthyes$ (cartilaginous fishes) are primarily marine. $Urochordata$ and $Hemichordata$ are exclusively marine organisms. Therefore,$Osteichthyes$ is the correct answer.