At Gorongosa, the sun shines down on the plants and allows them to go through photosynthesis, which creates food for the consumers and gives off oxygen. This also fuels cellular respiration in the plants, in which they give off carbon dioxide and water. This CO2 is now released into the atmosphere. When the animals, such as a reedbuck at Gorongosa eat the plants or producers, they are given energy, and food. Some of this food is turned into waste, which moves into the geosphere/lithosphere over time. It can be consumed by detritivores/saprotrophs, like animals such as worms, certain snails, and other insect-type creatures. They also feed on organisms that have died and aid in the decomposing process. Within the geosphere, there are fossils and fossil fuels. These are very high in carbon, and with time, can be brought toward the surface and broken up, releasing more carbon and CO2. They are also burned by humans, but in a natural state mostly stay below the ground.