Which provides food, provides shelter, and prevents erosion?

plants
scavengers
decomposers

Plants provides food, shelter and it prevents erosion.Plants is very useful, we get most of our foods from plants; the vegetable, fruits, condiments and spices. For shelter, plants commonly use for building houses. And plants are excellent control for erosion, the roots helps hold the sold and absorb the water. 

What's the yellow wallpaper?