Which of the following is an example of a compound? Group of answer choices

H2

O

H2O

Na

H2O is a compound because its a main constitute of earths hydrosphere

The correct option is C. The concentration of phosphate inside the cytosol is already greater than the concentration of phosphate in the surrounding fluid, yet, the cell still want to move more phosphate into the cell. To do this, energy is needed to move the phosphate ions against the concentration gradient, so the type of transportation requires is ACTIVE TRANSPORT.