1. Nitrogen Cycle
-many elements, including nitrogen, are recycled back and forth between organisms and their environments
-nitrogen is necessary for life to exist as it is a key component to amino acids and proteins

2. Nitrogen Cycle
-nitrogen is incorporated into plants (producers) by nitrogen fixation and used by animals (consumers) for food and protein synthesis
-nitrogen recycling occurs through the excretion of waste products and the death of organisms.

3. Nitrogen Cycle -sources of nitrogen include: -fertilizer -animal waste
-death and decomposition
-bacteria (release nitrogen gas)
-automobile exhaust
-places where nitrogen gets taken in:
-plants (through bacteria)
-air