Why can a cell not survive conditions of unlimited growth

 As the size of the cell or organelle increases the volume increases much faster than the surface area. If the cell is spherical and gains in size so it doubles its radius, the surface area is increased 4 times, but the volume is increased 8 times.

The reaction will shift to the right

Answer is: hydrogen is being oxidized.chemical reaction: co₂ + h₂ → co + h₂o.oxidation half reaction: h₂ → 2h⁺ + 2e⁻.reduction half reaction: c⁺⁴ + 2e⁻ → c⁺².oxidation is increase of oxidation number, hydrogen change oxidation number from neutral charge (in molecule of hydrogen) to oxidation number +1 (in water).