Environmental Science
Definition of ecosystem is

The abiotic component of a habitat
The community of organisms together with the environment in which they live
The part of the earth and its atmosphere which inhibits living organisms
A community of organisms interacting with one another

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Environmental Science
Mycorrhiza represents

Parasitic association between a fungus and roots of plants
Symbiotic association between a fungus and roots of higher plants
Parasitic association between a fungus and an alga
Symbiotic association between a fungus and liverworts

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