Practice problem
Oxygen Cycle — Definition & Diagrams
Image source: By Pexels CC0, via pixabay.com
Many ocean creatures form oxygen-rich calcium carbonate shells as protection. To which oxygen reservoir do these shells mainly contribute?
Practice problem
Image source: By Pexels CC0, via pixabay.com
Many ocean creatures form oxygen-rich calcium carbonate shells as protection. To which oxygen reservoir do these shells mainly contribute?