How many equivalent structures are necessary to describe the bonding in PO43-?

How each state changes and what it is called? Did any robots or satellites traveled in Uranus and what are there name? Why do farmers leave a strip of land around the edge that they do-not spray with chemicals? What encloses the cells of plants algae fungis and most types of bacteria? Who are the top players on river plate? What are the changes of state from water in the ocean through evaporation then condensation into clouds? Why are you younger on Saturn than Earth? What could be the need for Indian standard meridian? Will a dark painted pool retain more heat than a light colored one and cause the water temperature to be higher? What are the adavantages of fermentation in ethanol? What are the landforms that the kiowa lived on? If white glue is used to seal the stomata on the underside of plant leaves what will happen to the leaves? What is the main reason the results of research studies are published? What group of users serves as the primary participants in an ALPHA Test? What present the data gathered in table form to show some properties of common solutions observed? Do chemical reactions take place in the membrane? Is granite a heterogeneous or homogeneous mixture? How can index fossils help scientists figure out the ages of rock layers? How does different types of food production differ in their impacts on extinction and climate? Why H-CL is polar?

How many equivalent structures are necessary to describe the bonding in PO43-?