Leaf-cutter ants cultivate fungus. The ants keep conditions optimal for fungus growth and carry leaf fragments for the fungus to grow on. Then the ants feed on pieces of the fungus. Which kind of relationship exists between the fungus and the ants?

The relationship between the fungus and the ants is called mutualism.

the answers are consumer/producer

predator/prey
symbiotic
parasite/host

Apologies for the incorrect answer. You are right. The relationship between the fungus and the ants is called a "symbiotic" relationship. More specifically, it is a mutualistic symbiotic relationship, where both the fungus and the ants benefit from the association.