D two organisms depend on each other for survival.
Explanation:
Symbiotic relationship is a type of relationship between two organisms in which the both of them gain something positive from each other. A good example is the relationship between the cattle and egret. The egret helps in grooming the cattle and the cattle in return provides food for the egret.
In a symbiotic relationship, two organisms depend on each other for survival and is the right choice in the above question.
