Answer:
The difference is C
Anaerobic respiration uses oxygen, and aerobic respiration does not.
Explanation:
That they are <span>caused by microorganisms.</span>
C. Permafrost
Permafrost is the layer beneath the "active layer". The active layer consists of soil that freezes and thaws every year. However, the requirement for permafrost is that it be frozen for two or more years consecutively. This is why permafrost exists in cold environments such as tundras.
