Which statements are true of heterogeneous mixtures?

1) they settle out.
2) the proportions of solute to solvent may vary.
3) the solute is evenly distributed throughout.
4) they are composed of two solvents and two solutes.

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