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