Answer:
Fossil fuels
Respiration
Rocks
Explanation:
Carbon is ubiquitous and found almost everywhere in both living and non-living organisms. It is one of the most essential elements needed for life to function.
The natural sources of carbon include fossil fuels, respiration and rocks
- Fossil fuels are energy rich compounds derived from organic matter that has been preserved.
- The process of respiration releases carbon in form of carbon dioxide into the atmosphere as a by product.
- Some rocks are predominantly made up of carbon for example diamond and graphite.
