C-04-Q062mediumsingle_mcq
Which gas was first produced as a by-product of photosynthesis by unicellular life?
Which gas was first produced as a by-product of photosynthesis by unicellular life?
- aCarbon dioxide
- bOxygen
- cHydrogen sulphide
- dMethane
Which gas was first produced as a by-product of photosynthesis by unicellular life?