Which three of the following steps in the carbon cycle describe how carbon moves between Earth's subsystems? 1. When fossil fuels are burned, they release carbon dioxide into the air.
2. Decaying organic material buried in the crust turns into fossil fuels.
3. Plants use carbon dioxide in the air to perform photosynthesis.
4. Animals use carbon stored in plants by eating them.
5. Carbon dioxide in the air is dissolved in the oceans' shallow waters.