Write an account of the canal system in sponges. (UPSC 2017, 10 Marks, )

स्पंज में नहर प्रणाली का विवरण लिखें। (Write an account of the canal system in sponges.)

Write an account of the canal system in sponges. (UPSC 2017, 10 Marks, ) EN ह function dochangelang(val) { if (val != "") { window.location = val; } }