What term best describes the interaction between termites and the protozoans that feed in their gut allowing the termites to gain energy from the cellulose in the wood they eat?

mutualism

Explanation:

Mutualism is a type of ecological interaction between two species in which both have benefits (double positive interaction). Mutualism also can be considered as a type of symbiosis-two species that live together. Termites and protozoans are a great example of correlation between two species that work together and provide positive effect one to another. Termites provide food to protozoans, while protozoans provide energy to the termites.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.