When they breathe out. Also after they die, during decomposition.
Carbon dioxide
Plants take in carbon dioxide and give off oxygen through the process of photosynthesis. Animals take in oxygen and give off carbon dioxide through the process of respiration. This exchange of gases is essential for the survival of both plants and animals.
Plants must have carbon dioxide from animals. Animals give off carbon dioxide when they breathe and plants give off oxygen so it's a fair exchange.
carbon dioxide
carbon dioxide
Methane and carbon dioxide.
Animals give off carbon dioxide, which is essential for photosynthesis in plants. Plants use carbon dioxide, along with sunlight and water, to produce oxygen and carbohydrates for energy. This exchange of gases between animals and plants helps to maintain the balance of oxygen and carbon dioxide in the environment.
respiration
CaRbon dioxide.
Oxygen is actually breathed in by animals. It is carbon dioxide which is exhaled by animals. Plants take in carbon dioxide and give off oxygen.
During cellular respiration, plants take in carbon dioxide and give off oxygen while animals take in oxygen and give off carbon dioxide.Sorry if I didn't answer your question sufficiently!
Respiration