a collection of organisms and materials that interact
the place where animals live
unchanging, fragile systems that are easily damaged
only found in forests
Meter
Kilometer
All of the above
Centimeter
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
Conditions an animal needs to grow and reproduce
Boundaries
Resilience
Food webs
Scale
Sunlight
Dead plants
Animals
Soil