1. Protection of water resources.
2. Soils formation and protection.
3. Nutrient storage and recycling.
4. Pollution breakdown and absorption.
5. Contribution to climate stability.
No. it will continue cycling through the carbon cycle forever
The three main stages of cellular respiration (aerobic) would include Glycolysis, the Kreb's Cycle and the Electron Transport Chain. The Krebs Cycle takes Citric Acid which is a derivative of Pyruvic Acid and converts this through 4 cycles into Hydrogen, carbon dioxide and water in the Mitochondrial Matrix.
Globalized evolution...... but I might be wrong