Answer:
The answer is: Mutualistic relationship
Step-by-step explanation:
Mutualism, also known as the interspecies reciprocal altruism, is a type of symbiotic biological interaction in which both the organisms, belonging to different species, mutually benefit from each other. It is the most common type of biological interaction.
Mutualism is a long-term association that is beneficial for both the species.
As, in the interaction between termite and protozoan, both the species are benefiting from each other. Therefore, it is a mutualistic relationship or interaction.