What is the role of animals in nature and human life?

Animals have a strong influence on plants by feeding on them. Insects carry pollen and spread seeds of plants, pores of fungi, ensuring their dispersal. Different types of animals are closely related: some animal organisms serve as food for others. It is impossible to imagine human life without animals, especially pets. From them people get food, raw materials for industry. Horses, camels, yaks and even dogs are used as vehicles. Some animals are carriers of diseases. There are animals living inside other animals. Pests of crops and foodstuffs meet among animals.