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The "jelly layer" of jellyfish (and other cnidarians) is called the "mesoglea." The mesoglea is a gelatinous, mostly acellular layer composed of fibrous proteins, such as collagen. The mesoglea often have some muscle fiber bundles and nerves to maintain the mesoglea's form, as well as some amoebocyte cells to consume debris and invading pathogens. The mesoglea serves as an internal skeleton to help the cnidarian retain its form after it relaxes from contracting.

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What substance allows the moon jelly to float in the water?

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What kind of tissue makes up the skin?

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Does jellyfish have relationship with another organism where they both benefit from the relationship?

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