Refer to the figure. The activities of the nitrogen cycle, as represented in the figure, are
A) nearly all initiated by human activities.
B) nearly all initiated by bacterial activities.
C) chemical, rather than biological, in nature.
D) biotic and relatively unimportant to the nitrogen cycle.
E) abiotic and relatively unimportant to the nitrogen cycle.

Question

Refer to the figure.  The activities of the nitrogen cycle, as represented in the figure, are
A) nearly all initiated by human activities. 
B) nearly all initiated by bacterial activities. 
C) chemical, rather than biological, in nature. 
D) biotic and relatively unimportant to the nitrogen cycle. 
E) abiotic and relatively unimportant to the nitrogen cycle.

Quizplus · Accepted Answer

The figure shows various bacteria involved in different stages of the nitrogen cycle, indicating that nearly all activities are initiated by bacterial activities.

Refer to the Figure