Final answer:Sponges protect themselves through amebocytes and spicules, symbiotic relationships, and chemical defenses.Explanation:Sponges, which are simple multicellular organisms belonging to the phylum Porifera, protect themselves through various mechanisms. Three ways sponges protect themselves are:Amebocytes and spicules:Amebocytes are cells found in sponges that produce toxins and enzymes to deter predators. Spicules, which are tiny, sharp structures made of calcium carbonate or silica, provide physical protection against predators.Symbiotic relationships:Some sponge species form symbiotic relationships with other organisms, such as living in association with symbiotic bacteria. These bacteria may produce compounds that deter predators or compete with other organisms for resources.Chemical defenses:Sponges produce a wide variety of chemical compounds, some of which have defensive properties. These compounds can be toxic or unpalatable to potential predators.Learn more about Sponges' self-protection mechanisms here:brainly.com/question/1326746...

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