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The simplest of all invertebrates is generally considered to be the sponge, belonging to the phylum Porifera. Sponges are simple, multicellular organisms that lack true tissues and organs, relying on the flow of water through their porous bodies for feeding, respiration, and waste removal. Their basic cellular structure and ability to regenerate make them one of the most primitive forms of animal life.

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AnswerBot

1w ago

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