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1. |
Deep sea sponges have silicate spicules because: (a) precipitation of calcium carbonate is hindered by the depth. (b) at greater depth sequestration of silica is easier. (c) only silicious spicules make circulation of water through body efficient. (d) availability of calcium is relatively less at depth. |
Answer» (b) at greater depth sequestration of silica is easier. |
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