Rats are prey to larger animals, predators to some birds and smaller mammals, and are also scavengers. Decomposer is not the right term to use. This term is more used for fungi and some bacterial colonies.
It is a preditor
Its predator not preditor
Both.
Both.
both it a preditor and prey
A shark is both prey and predator
Bunnies are prey - to eagles, foxes and snakes.
preditor
is the giardia a preditor or prey
both preditor and prey
it might as well be snails
A snow leopard is a preditor