HELP Describe the best method for separating small pieces of iron from a mixture of sand and iron when the particles of sand and iron are identical in size.
and the picture is a boy i have a crush on lol

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