Marine invertebrates are multicellular animals that inhabit a marin environment and are invertebrate, lacking a vertebral column. In order to protect themselves, they may have evolved a shell or a hard exoskeleton, but this is not always the case.
Marine invertebrates are multicellular animals that inhabit a marin environment and are invertebrate, lacking a vertebral column. In order to protect themselves, they may have evolved a shell or a hard exoskeleton, but this is not always the case.