Does oxygen get cycled in the atmosphere on earth? How?

what is the potential difference across electrical load that have risistance of 4 and a current of 3 A following through it

Yes

Explanation:

oxygen is taken out of the air photosynthesis, then photosynthesis produces organic molecules that contain oxygen... through respiration and decay of living organisms, oxygen enters the lithosphere

because they want 2 and yea

if you know your abc's you should be able to get your answer or just use google