The answer is photosynthesis
- Burning of fossil fuels(these are the bones/particles of animals that have died thousands of years ago). When these fossil fuels are burned they lead to the production of carbon dioxide.
- Animal respiration- the cells in the body of animals helps in the production of carbon dioxide which is released into the atmosphere
- Plants decaying- when plants wither off due to lack of nutrients, they decay with time and then produce carbon dioxide.
- Photosynthesis- the end product of photosynthesis is glucose.
Hence the answer is photosynthesis
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