(2017·厦门三校高三联考)Many plants and animals live close together, and they depend on each other. They are usually very different from their partners, and yet all live easier lives because of each other. It is nature's idea of sharing.

　　An example of a partnership is the shark and pilot fish. The pilot fish is a little fish only about nine inches long. He would be helpless if he hung around by himself in the mighty ocean. He makes up for his size with his smartness. He cleverly swims beside the shark. When the shark eats, the pilot fish gets the leftovers. And the pilot fish needn't worry about his safety.

　　The shark also gets benefits from this relationship. The pilot fish cleans food scraps and insects from the shark's hide.

　　Another example of depending on each other is the sea anemone and striped clown fish. The sea anemone looks like a flower and has petals that contain poisonous stinging cells. When small fish swim into the petals, the anemone traps and paralyzes (使麻痹) them. However, the striped clown fish is able to swim into the poisonous petals without being harmed. When he is in danger, he quickly swims into the sea anemone and is unable to be seen by his enemies. To pay for his safety, the clown fish brings food to the anemone. He also guides other fish into the anemone's deadly trap.

　　Large mammals such as the ox, antelope, rhinoceroses and African buffalo form such a relationship with the red­billed ox­pecker. They provide daily meals for the bird. In fact the bird eats insects. The various large mammals act as a restaurant with a varied menu for the ox­pecker. What do they get in return from the bird? Free beauty treatments!

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