Meat should be put on first, and the heart should be in front, then other tissues, organs and bones. Every tissue and organ needs the support of bones after it is formed, so as not to be crushed by external forces. The growth of tissue needs blood to supply energy, so it should have a heart first. In a word, mother is great. When the fetus is in the belly, it is nourished by the mother, and the metabolites (commonly known as feces) are brought out together. When the digestive system of the fetus is perfect, it will be born, otherwise the feces will be discharged in the mother's stomach.
I'm not sure, but I think so. Specifically, you can download several network TV software, which contains science and education programs, and you can choose the programs you want to watch online.