The Cyanobacteria Found in the Internal Mucilage-Filled Cavities of Hornworts

Multiple Choice

The cyanobacteria found in the internal mucilage-filled cavities of hornworts serve to

A) provide structural support for the plant.
B) obtain mineral nutrients for the plant.
C) convert atmospheric nitrogen gas into a form usable by the plant.
D) convert atmospheric sulfur dioxide gas into a form usable by the plant.
E) provide carbohydrates to the plant.