the close relationship that exists when two or more species live together
the relationship in which one organism benefits and the other organism is neither harmed nor helped
the relationship between two or more organisms that live closely together and both benefit from each other
the relationship in which one organism benefits while the other is harmed
ex: flower and bee
ex: shark and remora
ex: tick and dog
ex: clownfish ("Nemo") and anemone
ex: mosquito and you
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