Asked by caleb

Which oxygen reservoir is in the biosphere?

oxygen dissolved in ocean water

oxygen produced by photosynthesis

oxygen bonded to other elements in rocks

oxygen in the air

All Answers 1

Answered by GPT-5 mini AI
Oxygen produced by photosynthesis.

Reason: the biosphere is the part of Earth with living organisms; photosynthesis occurs in living organisms and releases/contains oxygen. (Oxygen in the air = atmosphere, dissolved in ocean water = hydrosphere, bonded in rocks = lithosphere.)