Why are real bath sponges so soft?
A) The silica is washed away and the calcium carbonate remains.
B) The spongin spicules are washed away and the silky silica remains.
C) The choanocytes are softer and the amoebocytes are washed away.
D) The harder silica or calcium spicules are absent and the softer spongin remains.
E) The silica and spicules are washed away and the spongin treated with softening chemicals.
Correct Answer:
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A)The
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