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　Some animals do not make nest and their cubs were born on the ground such as antelope, zebra, hare, etc. The cubs can walk in a few minutes after birth, and can bounce and run in one or two hours. This is seemingly a common phenomenon but it is guaranteed by the perfect physical function of the body where the nervous system and muscle of the fetal must be completely mature before birth. Those animals that make nest, such as rats, rabbits, wolves, birds, etc., these physiology qualities are relatively poor due to the protection of the nest. The pups will hide in the nest for some time, and it will not be long for them to run or fly, in about fortnights or one to two months. Apes are arboreal animals without any lair, although the cubs cannot climb trees at birth, they will firmly grasp their mothers and are able to bounce freely in a few days, presumably the ancestors of human ancestors must also be similar. this physiological function has been completely lost. Now the baby at birth can only randomly move their hands and feet without any ability to turn over. It takes about one year for them to stand and walk, which is unique in the biological world in terms of the degree of slow development. If things keep going in this way, the baby's parenting will become increasingly cumbersome, complex, difficult, and a more expensive and very difficult task.　

　The viscera of human beings including heart, lung, intestine, stomach, liver, kidney, etc. are all developing along this revolution route—new lesions constantly occur and the incidence rate steadily rise. It is easily seen that all the so-called diseases are all related to the innate factors, and not just the part that was named as "genetic disease". So, all kinds of diseases caused by the bacteria and viruses seem to have nothing to do with the innate factors, right? No! As bacteria and viruses are omnipresent, all the creatures including the ancestors of human ancestors are surrounded by them at any place and any time, and the creatures must have sufficient immunity to coexist with bacteria and viruses and survive. Having a superb medical technology, disease resistance is no longer important to survival, and anti-infection ability of human beings also significantly decline especially with the invention of antibiotics and other new drugs in modern times. In recent years, biologists have found the reason that people are susceptible to influenza is because of one gene defect which leads to the loss of immunity to influenza. Now normal people will have diarrhea occasionally, and they will recover after taking medicines. Even if there is no medication, it can be self-healing in a few days. There are a few patients who cannot do without furazolidone every day for decades, and will have diarrhea if they skip medicine for once. This example is sufficient to show that the pathogenic microorganism is only an external cause while the body itself is internal cause. Now when the cattle, pigs and other livestock have undergone a surgical operation, they do not need intravenous antibiotics, rather only the wound dressing. Anthropoid must also be the same. If the same method is applied to modern people, then I am afraid it would be a miracle to "escape from death". It can be seen that the pathogenicity of microbes is not unilaterally determined by microorganisms. When the body degenerates to a certain extent, the microorganisms that originally are not pathogenic will become pathogenic. All new drugs developed need to do experiments on animals, and this is the reason why many new drugs that work well on other animals have disappointing effect on human beings.