The weakest symbiotic association, in which one species simply lives better in the presence of another species is

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Commensalism is the weakest symbiotic association as it only benefits one species without harming the other. The other species may not be affected positively or negatively, but could simply provide better living conditions for the commensal species. Competitive exclusion refers to the elimination of one species by another through competition, mutualism involves both species benefiting from the interaction, facultative obligate mutualism is a contradicting term, and parasitism involves one species benefiting at the expense of the other.

The Weakest Symbiotic Association, in Which One Species Simply Lives