A mosquito feeds on blood from a horse. In turn, it passes infection into the horse's bloodstream. This is an example of symbiosis.
What symbiosis mean?
Symbiosis, any of several living arrangements between associate of two other species, including mutualism, commensalism, and parasitism.
Both positive and negative associations are therefore contain, and the members are called symbionts.
Thus, option "B" is correct.
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