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