Spicules of silica occur in

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(A) Spicules are the skeletal structures found in sponges (Phylum $Porifera$).$Hyalonema$,also known as the glass rope sponge,is characterized by havi

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Hyalonema

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(A) Spicules are the skeletal structures found in sponges (Phylum $Porifera$).$Hyalonema$,also known as the glass rope sponge,is characterized by having a skeleton composed of siliceous spicules.$Sycon$,$Leucosolenia$,and $Grantia$ typically possess calcareous spicules (made of calcium carbonate).Therefore,the correct option is $A$.

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