Sponge Develoment

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The sponge, a many celled animal, begins its life as a single-cell, the egg. After division of cells and formation of blastula, the young larva leaves the parent. The next transformation consists of a pushing in of one side. This depression deepens and gradually results in the formation of a two layered sac know as the gastrula.




Winchell, Alexander Sketches of Creation (New York, NY: Harper & Brothers, 1870)


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