Water and carbon dioxide are given off.
Carbon dioxide
Carbon dioxide
6CO2 and 6H2O
Oxygen will be given off
When they breathe out. Also after they die, during decomposition.
This is because, all thermal decomposition ( and all decomposition processes ) is an exothermic process. Well, if you need a full explanation, here goes. More energy is given off to form bonds then taken in to break bonds hence it is an exothermic reaction. Also, decomposition gives off heat energy.
carbon dioxide
during photosynthesis plants take in carbon dioxide and give out oxygen
The gas is Carbon dioxide, formed by the decomposition of Calcium carbonate it the Marble or Limestone
Oxygen is given off during photosynthesis.It is during the aerobic cellular respiration of the leaf cells that carbon dioxide is given off.
Oxygen
helium and some neutrons