During the last three months, the organs and features mature enough to function well after birth. Patterns of human development are similar to those of other vertebrates. Inadequate child care may lead to lower physical and mental ability. Various body changes occur as adults age. Muscles and joints become less flexible, bones and muscles lose mass, energy levels diminish, and the senses become less acute.
Women stop releasing eggs and, hence, can no longer reproduce.
The length and quality of human life are influenced by many factors, including sanitation, diet, medical care, sex, genes, environmental conditions, and personal health behaviors. The FOSS program does not include a component developing concepts related to Human Identity and Human Development at this level. For the body to use food for energy and building materials, the food must first be digested into molecules that are absorbed and transported to cells. To burn food for the release of energy stored in it, oxygen must be supplied to cells, and carbon dioxide removed. Lungs take in oxygen for the combustion of food, and they eliminate the carbon dioxide produced.