Answer:
C. Electron, atom, molecule, cell
Matter can be classified according to physical and chemical properties. Scientists can observe physical properties without changing the composition of the substance, whereas chemical properties describe the tendency of a substance to undergo chemical changes (chemical reactions) that change its chemical composition.
PS, love your pfp :)
The answer your looking for is here Anisogamete
Water transport across cell membranes occurs by diffusion and osmosis.