1. | Aerobic as it release more energy |
2. | Anaerobic as it releases more energy |
3. | Aerobic as it is more complex |
4. | Anaerobic as early atmosphere contained no free from of oxygen |
1. | Devonian period | - | Age of fishes |
2. | Carboniferous period | - | Age of amphibians |
3. | Ordovician period | - | Age of invertebrates |
4. | Cretaceous period | - | Age of reptiles |