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Characteristics
Evolution
Homeostasis
Energy
A species
An omnivore
An experiment
A heterotroph
An autotroph
An omnivore
A carnivore
Phosphorus
Carbon
Nitrogen
Calcium
Carnivores
Herbivores
Omnivores
A bog
A lake
An estuary
An aphotic zone
Extinct
Endangered
Isolated
Diversified
Pollution
Use of pesticides
Acid precipitation
Preservation of habitats
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