It is a symbiotic relationship.
parasitism
What type of relationship exists between time and wind speed?
Competition is another relationship that exists between organisms
What type of relationship exists between the crocodile and anaconda
competition
they have intercourse
mutualism
Symbiotic relationships
that they had sex
commensalism
The cat is the predator and the mouse is the prey.
No particular relationship exists between the two for the simple reason that such relationship(if any exist) depends on the material one is concerned with.