Cycling of nitrogen between soil, water, and the atmosphere
Conditions an animal needs to grow and reproduce
Flow of energy from one organism to another in a food web
Living and non-living things in an area and their interactions
a collection of organisms and materials that interact
unchanging, fragile systems that are easily damaged
only found in forests
the place where animals live
Animals
Sunlight
Dead plants
Soil
Boundaries
Resilience
Food webs
Scale
Meter
Centimeter
Kilometer
All of the above