Sponge

SPONGE is a primitive multi-cellular aquatic animal of the phylum Porifera that filters food from the water as it drifts by. Sponges occur in many colours, including white and black, and in many forms, including thin encrusting mats, attached spheres and erect tube-like, vase-like or branching growths reaching heights of 2 m or more. When broken, some smell like exploded gunpowder. Sponges are common in most marine habitats from the intertidal zone to depths greater than 700 m. More than 260...

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