Categorized | Porifera (sponges)

Unidentified Sponge

Posted on 15 February 2013 by Nazca admin

Sponges are simple sessile animals that lack internal organs, nerves, and muscles. They have a skeletal system made up of spicules formed by calcium or silica derivatives that give rigidity and form to their bodies and also serve for defense. Various types of specialized cells perform functions to pump water, produce spicules, and perform digestion and reproduction.

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