The concept of animals: the animal is a biological category. Synthesis of inorganic general can not be organic, and can only organic compounds (plants, animals or micro-organisms) by email, and the plants have different morphology and physiological function, for feeding, digestion and absorption, respiration, circulation, excretion, feelings, reproductive lives, such as sports and activities. According to the classification of animals Zoology nature of the animal form, the internal body structure, the characteristics of embryonic development, physical habits, living environment, such as the geographical features, will be the same or similar characteristics of the animal under the same category.