The positive interaction between individuals of different species whereby both species are benefited and it is essential to their existence is known as:

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Mutualism is the only option that describes a positive interaction where both species benefit and it is essential to their existence. Commensalism describes a positive interaction where one species benefits and the other is unaffected. Symbiosis is a broad term that includes mutualism, but also encompasses parasitism and commensalism. Protocooperation describes a positive interaction where both species benefit, but it is not essential to their existence. Herbivory describes a type of predation where one species benefits and the other is harmed.

The Positive Interaction Between Individuals of Different Species Whereby Both