Gas X is a waste gas released during digestion in animals. Gas Y is formed when gas X is combusted with too little oxygen. Gas Z is formed when gas X is combusted with too much oxygen. What are X, Y and Z?
- AX: carbon dioxide; Y: methane; Z: carbon monoxide
- BX: carbon monoxide; Y: methane; Z: carbon dioxide
- CX: methane; Y: carbon dioxide; Z: carbon monoxide
- DX: methane; Y: carbon monoxide; Z: carbon dioxide