All of the above
Meter
Kilometer
Centimeter
a collection of organisms and materials that interact
unchanging, fragile systems that are easily damaged
the place where animals live
only found in forests
Cycling of nitrogen between soil, water, and the atmosphere
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
Boundaries
Resilience
Food webs
Scale
Animals
Soil
Dead plants
Sunlight