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