Dr. Priyanka Dadupanthi, Biyani Girls college, Jaipur, explains about evolution of canal system in sponges. In members of phylum Porrifera, the body is organized in such a manner so as to form a complex system of pores and internal canals. This system is sponges referred to as canal system. This system plays an important role in providing nutrition, excretion, respiration and circulation. According to the arrangement and complexity of the internal channels, canal system has been classified into three major forms like Asconoid, Syconoid and Leuconoid. www.gurukpo.com, www.biyanicolleges.org
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