The interactions of the biosphere with all the other spheres are important for the balance and stability of ecosystems. What is an example of the biosphere positively interacting with the geosphere?

A.
Carbon dioxide gets released during respiration.
B.
Humans allow livestock to overgraze, which depletes the soil of its nutrients.
C.
Decomposers break down decaying organisms to replace nutrients back into the soil.
D.
Volcanoes erupt creating an increase in carbon dioxide.