tolong bantu yg bagian A *malasmikir*

1. Nitrogen
2. Lichen and algae
3. A form of nitrogen that can be taken up by the roots of plants
4. They change nitrogen into chemicals called nitrate
5. The roots of plants take the nitrate from the ground. The plants are eaten by the animals in turn. Some nitrogen is passed out in the manure. This manure and animal remains then help feed the soil.