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