Which is a characteristic of a decomposition reaction?
1. substance p replaces x in the compound xy.
2. substance xyz breaks down into x, y, and z.
3. substance z burns in the presence of oxygen to form zo.
4. substance x combines with y to form compound xy.

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