While collecting samples from the seafloor, you find a new species of sponge. How can you determine whether the new sponge is in Class Calcarea or Class Hexactinellida? I
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Calcarea sponges have spicules made of calcium carbonate ($CaCO_3$), while Hexactinellida sponges have spicules made of silica ($SiO_2$). Show more…
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