Which term describes an organism that lives commensally within the nest of another organism?

• A. Inquiline.
• B. Epigeal.
• C. Myrmecophile.
• D. Parasite.

Answer: (A)

Living inside another species' nest as a neutral tenant is described by inquiline. The term comes from the idea of occupying a “tenancy” in someone else’s home, using space and resources without providing a benefit to the host or causing harm. Insects that live in ant or termite nests often fit this pattern, basically hitching a ride as a quiet resident.

Epigeal refers to living on the soil surface, not inside a nest, so it’s not about nest dwelling. A myrmecophile is any organism associated with ants and can be mutualistic or parasitic, not specifically about living commensally inside a nest. A parasite gains by harming the host, which contradicts the neutral relationship implied by commensalism. So the nest-dwelling, neutral relationship is best captured by inquiline.