GENERAL HISTOLOGY

Detailed explanation-1: -Ans: Vertebrata is a subphylum of Chordata. The vertebrates have a vertebral column, something like the notochord. Vertebrates show all the characteristic features of the phylum Chordata, such as the notochord, dorsal nerve cord, pharyngeal slits and post-anal tail.

Detailed explanation-2: -Chordates are animals that have a notochord, post-anal tail, dorsal hollow nerve cord, and pharyngeal slits. Chordates include all vertebrates and some invertebrates.

Detailed explanation-3: -The phylum chordata includes all animals that share four characteristics, although they might each possess some of them at different stages of their development: a notochord, a dorsal nerve cord, pharyngeal slits, and a postanal tail.

Detailed explanation-4: -A notochord is present in the phylum Chordata (comprising three subphyla: amphioxus, tunicates, and vertebrates) and, more arguably, in some other animals.

Detailed explanation-5: -The lancelet, like all cephalochordates, has a head. Adult lancelets retain the four key features of chordates: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail. Water from the mouth enters the pharyngeal slits, which filter out food particles.