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B
Tentacles
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C
Spicules
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D
Spongin fibres
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Solution
The correct option is D Spongin fibres When bath sponges (Euspongia) dries up, only the skeleton, which is made up of spongin fibers is left behind. Spongin is an organic horny elastic substance. They are fibers insoluble, chemically inert and resistant to protein digesting enzymes.