Fanning a fire increases the oxygen near the fire, and then nothing was heard but the bellows which fanned the fire of the furnace. Given these facts, using a bellows can do what to the oxygen near a fire?  among the following options:
- increase
 - evaporation
 - diminish
 - absorb
 - decrease
 - It expands
 - electrically
 - heat


 

 increase        