Aphids produce a sugary substance that ants love. Ants protect the aphids from predators and parasites. Is this an example of commensalism, mutualism, parasitism, or predation

This is an example of mutualism. In mutualism, both species involved benefit from the interaction. In this case, aphids provide ants with a sugary substance called honeydew, which serves as a food source. In return, ants protect the aphids from predators and parasites. Both species gain an advantage from this relationship.