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