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Sponges are the
members of this phylum. They are simple and primitive animals that
probably have evolved from flagellated protozoans. These animals
lack tissues, and their body resembles a sac perforated with holes.
The name Porifera means, "Pore bearer".
Most sponges are marine, and only a few
live in fresh water, and most are asymmetrical and are filter
feeders. Sponges are sessile animals in which they are
attached to a fixed spot and don't move.
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05/07/02