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Pren
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c.73 Levels of Organization in an Ecosystem
Organism
Ecosystem
Population
Community
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c.74 Exploring a Food Web
Producers
First-levelconsumers
Third-levelconsumers
Second-levelconsumers
Decomposers
Red fox
Woodpecker
Garter snakeShrew
Cottontail rabbitField mouse Grasshopper
Termite
Fungi and bacteriaFungi and bacteria
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75
An
En
erg
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76
Th
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78 Primary and Secondary Succession
Primary succession
Secondary succession
Bare rock Pioneer speciesappear
Grassy weedstake root
Tree seedlingsand shrubs appear
Weeds andwildflowersgrow
Pine seedlingsand otherplants take over
Pine forest grows Pine-oak-hickoryforest is developing
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79
Log
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80 A
n E
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Po
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Pla
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81 E
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82 A Geothermal Power Plant
Cooling tower
Pump
Power plant
Cold waterpumped down
Magma
Bedrock
Steam risesto plant
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83 N
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Fiss
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Ener
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84 A
Nu
clea
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ow
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lan
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85 N
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