Answer the following question given this paragraph: 

The nitrogen cycle moves nitrogen back and forth between the atmosphere and organisms. Bacteria change nitrogen gas from the atmosphere to nitrogen compounds that plants can absorb. Other bacteria change nitrogen compounds back to nitrogen gas, which re-enters the atmosphere.


Q: The nitrogen cycle moves nitrogen back and forth between the atmosphere and what?

 Choices:

- Ocean

- Ozone Layer

- sediments

- organisms

A:
organisms
