Which organisms fix nitrogen into forms like ammonia? a. bacteria b. algae c. humans d. plants

Organisms like BACTERIA fix nitrogen into forms like ammonia. In fact, over 90% of the nitrogen fixation that occurs is due to the bacteria.

Bacteria.

Explanation: The nitrogen that is present in the environment is not used by the plants in the same form it must be converted in a usable form.

The nitrogen that is present in the environment is in the form of gas and it needs to be fixed by the bacteria present in the roots of the plants.

These organism convert the nitrogen gas into nitrate which is used by the plants.