What is the most likely effect a decrease of plant life in the biosphere would have on the atmosphere?

a.

A decrease in plant life would have no effect on the atmosphere.

b.

A decrease in plant life would cause carbon dioxide levels to increase and oxygen levels to decrease.

c.

A decrease in plant life would cause carbon dioxide levels to decrease and oxygen levels to increase.

d.

A decrease in plant life would cause an increase in all gases in the atmosphere.