Sponge Develoment Small 320×301 Medium 640×601 Large 1024×962 Download Tiff Original 2400×2255 | (294.9 KB) Description The sponge, a many celled animal, begins its life as a single-cell, the egg. First division in into two cell stage. Keywords sponge, sponge stages Galleries Sponges Source: Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)
