GENERAL HISTOLOGY

Detailed explanation-1: -Complete step by step answer: Water vascular system is the most distinctive feature of the Echinoderms. It is the modification of coelom, which consists of a system of canals filled with watery fluid. Various types of canals together form the water vascular system.

Detailed explanation-2: -Water vascular system is a distinctive feature present in echinoderms.

Detailed explanation-3: -Echinoderms possess a unique ambulacral or water vascular system, consisting of a central ring canal and radial canals that extend along each arm. Water circulates through these structures and facilitates gaseous exchange as well as nutrition, predation, and locomotion.

Detailed explanation-4: -Echinoderms evolved from animals with bilateral symmetry. Although adult echinoderms possess pentaradial symmetry, their larvae are ciliated, free-swimming organisms with bilateral symmetry. Later, during metamorphosis, the left side of the body grows at the expense of the right side, which is eventually absorbed.

Detailed explanation-5: -Water vascular system is a characteristic feature of the phylum, Echinodermata. It consists of an array of radiating channels, tube feet, and madreporite.