What is "vertebrate"?

Vertebrate refers to a group of animals with a backbone or spinal column. They are part of the phylum Chordata and include mammals, birds, reptiles, amphibians, and fish. Vertebrates have an internal skeleton made of bone or cartilage that protects their nervous system and provides support for their bodies. They also have a well-defined head with a brain and sensory organs, such as eyes, ears, and a nose. Vertebrates have a closed circulatory system with a heart and blood vessels that transport oxygen and nutrients to their cells. They are characterized by their ability to move efficiently on land, in water, or in the air, thanks to their complex muscular system.