EVERYDAY SCIENCE

Detailed explanation-1: -Chordates do not have an exoskeleton; they have an endoskeleton, which is an internal skeleton. The chordate skeleton includes structures called vertebrae in a subphylum of organisms called vertebrates, which includes humans, fish and amphibians.

Detailed explanation-2: -"The four distinctive characteristics that, taken together, set chordates apart form all other phyla are the notochord; single, dorsal, tubular nerve cord; pharyngeal pouches; and postanal propulsive tail.

Detailed explanation-3: -All its members, called chordates, have bilateral symmetry, as well as a head, a body cavity, a digestive system, and body segmentation. In addition, chordates have several unique structures. One such structure is the notochord.

Detailed explanation-4: -Key Points The notochord provides skeletal support, gives the phylum its name, and develops into the vertebral column in vertebrates. The dorsal hollow nerve cord develops into the central nervous system: the brain and spine.