The number of cubs in mammals depends on the anatomical features of a particular animal species. Nature stipulates that the calves be provided with the food they need. At first, the female feeds the offspring only with milk, which has a very high nutritional value and contains all the necessary substances for the growth and development of the cubs. For example, a domestic dog that brings 3–8 puppies has 8 nipples. In a domestic pig, the average number of piglets born is 10-14. Typically, a sow has 6-7 pairs of nipples. The horse has only 2 nipples and it produces only one, very rarely 2, foal. The number of nipples in mammals is not constant and can range from 2 to 22.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.