What is the symbiotic relationship between plants, animals, and bacteria?

Symbiotic relationships have one organism, the symbiont, which lives or feed in or on another organism, the host

There are three forms of symbiotic relationship;

Parasitism - A symbiotic relationship where a symbiont lives off and harms the host.

Mutualism - When both benefits from the relationship

Commensalism - A relationship where one partner benefits and the other neither benefits nor is harmed.

For your specific question, perhaps it's best to see under which category does the relationship between plants, animals and fall under to make a conclusion.