The difference between vertebrates and invertebrates.

Invertebrates do not have a backbone, while vertebrates have a well-developed internal skeleton of cartilage and bone and a highly developed brain, which is surrounded by a skull. The nerve cord is surrounded by vertebrae – the individual bones that make up the vertebral column. Vertebrates have well-developed sensory organs, a respiratory system with gills or lungs, and bilateral symmetry with a developed nervous system, which further distinguishes them from invertebrates.

Vertebrates are divided into two groups: animals without jaws and animals with jaws. While most vertebrates can roam and be heterotrophic, some invertebrates may be able to make their own food.