mutualism parasitism predation commensalism
I gave my students this multiple choice question: Termites eat wood but cannot digest it. Protozoans live in the termites' stomachs and use enzymes to break down the wood. The digested wood provides nutrition for both the termites and the protozoans. What type of relationship is this?

Only one answer is correct among these 4 choices:
- mutualism
- parasitism
- predation
- commensalism

Could you tell me which one is correct?

mutualism