In a reaction catalyzed by the enzyme rubisco, CO2 combines with a molecule (ribulose 1,5-bisphosphate) to form two molecules of a molecule (3-phosphoglycerate).

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.

i think its 5049.

i hope this !