What gas is given off by animals and is needed by plants?
CO2 (carbon dioxide) is exhaled by animals and needed by plants for photosynthesis.
Oxygen is the mist important as it is needed for respiration wich is the breaking down of glucose to produce energy. oxygen is the gas that is very important to the living things. ANIMALS AND US HUMANS USES THIS KIND OF GAS. The plants is needed a carbon dioxide it is also one of a gas. and thus plants is also a living organism.