One of the good friends: clownfish and sea anemone
The relationship between clownfish and sea anemone is a typical mutualistic symbiotic relationship. They depend on each other and cooperate with each other to provide protection and food for each other.
Clownfish are very small tropical fish that usually live in sea anemones near coral reefs or rocks. They have some mucus on their bodies that protects them from the anemone's sting, so they can swim freely around the anemone without fear of being stinged.
Sea anemones also benefit from this symbiotic relationship. As the clownfish swim around them, they activate the anemone's tentacles so the anemone can absorb more nutrients. In addition, the clownfish will remove weeds and food debris around the anemone, helping the anemone stay clean.
In short, the mutualistic symbiotic relationship between clownfish and sea anemone is a very close cooperative relationship. They depend on each other, help each other, and survive together.