In a symbiotic relationship, A a parasite eats its host. B there are too many carbon emissions in the atmosphere. C the environment is rapidly thrown out of balance. D two organisms depend on each other for survival.

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.

life would be meaningless without memes