Which type of relationship is formed when a bristle worm lives on a White Sea urchin

I believe it is a parasitic relationship.

Explanation:

Parasitic relationships one benefit one organism by harming the other. Some worms are known to latch onto onto a seaurchin's body and eat the spines while other crawl into the mouth and live off the host. Sounds gross but I hope this helps!

producers: apple trees, potatoes, carrots, grains, acorns, cabbage, grass, corn, lettuce

consumers: deer, mice, rabbits, chickens, squirrels, horses, worms, cows

predators: eagles, frogs, wolves, owls