What are Vertebrates?

Vertebrates are animals with a backbone, also know as a spinal column. The main evolutionary reason for the evolution of vertebrates is the need for a strong supportive structure for durability. Vertebrates are named for their vertebra, which are segmented sections of the spinal column. These segmented sections give the spinal column some flexibility while maintaining its strength. The vertebra are surrounded by nerve fibers that deliver commands from the brain to all the limbs. Many vertebrates have brain inside of a cranium, a spinal cord, a closed circulatory system, and a heart divided into two to four chambers.

Frogs are considered vertebrates.