Soil
Animals
Sunlight
Dead plants
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
Scale
Resilience
Boundaries
Food webs
the place where animals live
unchanging, fragile systems that are easily damaged
a collection of organisms and materials that interact
only found in forests
Centimeter
Meter
Kilometer
All of the above