Ecologists study the relationships among biotic & abiotic factors at 5 broad levels:

Organisms, population, communities, ecosystem, and biosphere.


Single Organisms:
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Ecologists ask questions about the adaptations that enable organisms to

meet challanges posed by their environments.


Population:
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Ecologists ask questions about factors that affect the size & growth of the population.


Communities:
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Ecologists investigate interactions among organisms in a community.


Ecosystems:
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Ecologists questions at the ecosystem level may relate to the flow of energy & chemicals.


Biosphere:
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Ecologists ask questions that involve global issues.