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