This is what we call SYMBIOTIC, a close and long-term biological interaction between two different species of organisms. (both species depend on each other for survival) or facultative (they can survive independently). The relationship can vary in nature: MUTUALISM: Both organisms benefit from the interaction. COMMENSALISM: One organism benefits while the other is neither helped nor harmed. PARASITISM: One organism benefits at the expense of the other. | Sylvester Kalizang'oma