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