The importance of animals in nature and human life?

Animals play an important role in the life of nature and humans. In nature, each animal fulfills its specific role. In human life, animals are sources of milk, skins, meat, fertilizers and emotional pleasure. People give birth to farm animals for meat, skins, eggs, wool, milk. Pets to get positive emotions. Many animals serve as orderlies for nature, loosen the soil, rid plants of pests, destroy weeds, and serve as food for other animals. In nature, everything is interconnected.