Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> CaSO4 is used by the marine organisms for shell formation.

• A. True
• B. False

Answer 1

The correct option is B False

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> To build shells, organisms extract calcium ions (Ca2+) and carbonate ions (CO32-) from seawater, which combine into the solid crystals of calcium carbonate (CaCO3) which shells are made up of. <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->