Answer:
1. CO2 released by animals
2. CO2 given off by decaying organisms
3.O2 released by plants
4. O2 taken in by animals
5. O2 from photosynthesis supplied to animals
6. CO2 From respiration supplied to plants
Thats my opinion
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Answer:
1. CO2 released by animals
2. CO2 given off by decaying organisms
3.O2 released by plants
4. O2 taken in by animals
5. O2 from photosynthesis supplied to animals
6. CO2 From respiration supplied to plants
Thats my opinion