Once there was a gas named G. I'm here to tell you his story.
One day, G was kidnapped by some flowers. They used photosynthesis to suck him in. G the Carbon was sucked into the Chloroplast, which is where photosynthesis takes place. In photosynthesis, light energy is used to to create food energy for the plant.
Then, a bunny came out of no where and pounced at the flower. Because he was in the flower, he was absorbed by the bunny.
A few minutes later, G would be let out into the atmosphere. Most of him would be let out through a process called cellular respiration. This is the process where the O2 that is absorbed by the animals mitochondria is released into the atmosphere as CO2. All living organisms undergo Cellular Respiration.
There is still small parts of G left in the bunny. Once the bunny dies, decomposers like mushrooms, soil, and bacteria break down the remains, setting free some more parts of G and CO2 into the atmosphere. A decomposer is an organism that decomposes organic material. Decomposers are also the only organism that can release dead materials carbon.
And now for the very last parts of G. The bones of the bunny will sink into the ground. Eventually buried in the ground.