Select the option that can be used as a one-word substitute for the given group of words.

An animal with a spinal cord

Vertebrate

The option that can be used as a one-word substitute for "an animal with a spinal cord" is vertebrate.

• Amphibian means a cold-blooded animal that can live both on land and in water.
• Mammal means a warm-blooded animal that has hair or fur, gives birth to live young, and nurses its young with milk.
• Invertebrate means an animal that does not have a backbone.

Therefore, the word vertebrate is the best choice because it describes an animal that has a backbone, which is the defining characteristic of this group of animals.