| Answer | Crossword Clue |
|---|---|
| invertebrates | INVERTEBRATE, an animal lacking a spinal column |
| invertebrate | an animal lacking a spinal column |
| vertebrates | An animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes |
| vertebrate | An animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes |
