Environmental Science
Definition of ecosystem is

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

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Environmental Science
Mycorrhiza represents

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

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