Environmental Science
Which one is true?

commensalism when the interaction is useful to both the populations
symbiosis when neither population affects each other
symbiosis when the interaction is useful to both the populations
commensalism when none of the interacting populations affect each other

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Environmental Science
Mycorrhiza represents

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
Parasitic association between a fungus and an alga

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