Why Are Bath Sponges So Soft

Why are bath sponges so soft?

A) Silica is washed away and the calcium carbonate remains
B) Spongin spicules are washed away and the silky silica remains
C) The choanocytes and amoebocytes are softer
D) Bath sponge support is provided primarily by spongin proteins
E) All of the choices are correct Spongin is a soft protein present in the body wall of bath sponges.Bath sponges lack calcareous or siliceous spicules.

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