* Decompose organic matter, releasing nutrients back into the soil
* Form symbiotic relationships with plants, helping them to absorb nutrients and water
* Play a role in the carbon cycle
Grass
* Provide food and shelter for animals
* Help to prevent soil erosion
* Can be used to make food, such as bread and cereal
Shrub
* Provide food and shelter for animals
* Help to prevent soil erosion
* Can be used to make medicine
Tree
* Provide food and shelter for animals
* Help to clean the air
* Can be used to make wood products, such as paper and lumber