You didn’t give us the options???
anyways: Water diffusion is called osmosis. Oxygen is a small molecule and it's nonpolar, so it easily passes through a cell membrane. Carbon dioxide, the byproduct of cell respiration, is small enough to readily diffuse out of a cell. Small uncharged lipid molecules can pass through the lipid innards of the membrane.
Answer:
Energy is absorbed, so the mass is increased. Energy is released, so the mass is increased
The reaction is missing the Zn(s) in the reactants. The stoichiometry of the copper/zinc is 1 mole to 1 mole
You can find carbon by itself or with other naturally occurring compounds, in all organic compounds (carbohydrates and nucleic acids), and in every living thing
