What does the crossing over rule essentially help us figure out? In chemistry

What is a metal replacement reaction

Select all of the methods through which a drug can enter your body. injection swallowing inhalation absorption

If the concentration of phosphate in the cytosol is 2.0 mm and the concentration of phosphate in the surrounding fluid is 0.1 mm, how could the cell increase the concentration of phosphate in the cytosol? a) passive transportb) diffusionc) active transportd) osmosise) facilitated diffusion