Ca3(PO4)2 Choose one or more: Calcium is the cation. Calcium is the anion. Phosphorus is the cation. Phosphorus is the anion. Oxygen is the cation. Oxygen is the anion. Phosphate is the polyatomic cation. Phosphate is the polyatomic anion. It would be named as a molecular compound. It would be named as an acid.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.