Water and carbon dioxide are given off.
Carbon dioxide
Carbon dioxide is a greenhouse gas given off during decomposition. When organic matter breaks down, it releases carbon dioxide into the atmosphere as a byproduct of microbial respiration.
during photosynthesis plants take in carbon dioxide and give out oxygen
During cellular respiration, two things given off are carbon dioxide and water. These byproducts are released as a result of the breakdown of glucose and other molecules to produce energy.
When they breathe out. Also after they die, during decomposition.
carbon dioxide is produced when it is heated
Carbon dioxide (CO2) is released during the decomposition process as organic matter breaks down and is broken down by bacteria and fungi.
The gas is Carbon dioxide, formed by the decomposition of Calcium carbonate it the Marble or Limestone
Oxygen
Plants give off oxygen during photosynthesis and carbon dioxide during respiration.
A chemical reaction
helium and some neutrons