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