The relationship between this seaweed and the clownfish is called commensalism.

You can find clownfish in the sea.

The dog is troubled by fleas.

In this forest, various organisms live by building a relationship of mutualism.

I like eating seaweed.

In this forest, various organisms are living in symbiosis.

I saw a bear in the forest.

He often gets treated to dinner by his friends.

He is called the smartest in the class.

She called him by his name.