What gases do living organisms take in and give off?

Question

What gases do living organisms take in and give off?

Answer 1

It depends on the process going on;

Aerobic Respiration: Carbon Dioxide and water vapours

Anaerobic Respiration: Carbon Dioxide

Photosynthesis: Oxygen

Chemosynthesis;Methane, Sulphur

Decomposition: Ammonia, methane etc

Answer 2

animals take in oxygen and give out carbon dioxide.whereas plants, in the day take in carbon dioxide, the gases given out are water vapour and oxygen, and in the night plants take in oxygen  and give out carbon dioxide. i guess these are the main gases that living organisms take in and give out...