All living organisms contain carbon. As organisms grow, they require large quantities of carbon to carry out life processes and make new cells. What is the source(s) of the most often used of Earth's readily available carbon?
New carbon atoms are constantly being created by the process of photosynthesis.
Carbon is constantly transported from the mantle to the crust by volcanic eruptions.
Carbon is constantly recycled from dead and living organisms back into the soil, water and atmosphere.
Carbon atoms are constantly transferred from the Sun to Earth along with sunlight.