Problem
A. Discuss the role that Carbon dioxide (CO2) plays in the global biosphere.
B. Discuss the role that Carboniferous (Paleozoic) pteridophytes (ferns) play in the global biosphere.
C. Discuss the role that Coal plays in the global biosphere.
D. Discuss the role that Modern-day corn (an angiosperm) plays in the global biosphere.
E. Discuss the role that Fossils play in the global biosphere.