2.  decomposers

3.  water

4.  Temperature

1.  producers

2.  consumers

3.  Man

1.  Savannah

2.  Prairi

4.  Melee

1.  Mountain

2.  Desert

3.  Forest

1.  10 m

2.  10-100 m

3.  100-300 m

1.  1%

2.  10%

3.  40%

2.  relationship between organisms and their environment

3.  relationship between plants and animals

4.  relationship between plants, animals and microbes

2.  food web

3.  food pyramid

4.  biotic potential

1.  Unit per area

2.  Food per individual

4.  None of the above

1.  Plant and animals only

2.  Physical environment only

3.  Microbes only