That describes a parasitism relationship, which is a specific type of symbiotic relationship.

Here's a breakdown:

* Symbiosis: Any close and long-term interaction between two different biological species.

* Parasitism: A type of symbiosis where one organism (the parasite) benefits at the expense of the other organism (the host). The parasite often lives on or inside the host, causing harm.

Examples of Parasitism:

* Ticks on a dog: Ticks feed on the dog's blood, causing irritation and potentially transmitting diseases.

* Tapeworms in the intestines of humans: Tapeworms absorb nutrients from the human host, often causing health problems.

Let me know if you have any other questions about symbiotic relationships!