Giant african millipedes often serve as the home for small mites that scavenge organic matter, but the millipedes do not appear to be affected by the interaction. this is an example of

Commensalism

Explanation:

Commensalism is an association where one of the two organisms benefits while the other is neither benefited nor harmed.

Here, the Giant African millipedes is not affected by the interaction, while the small mites benefits the shelter of a home.

Thus, it is an example of Commensalism