To understand Castleman disease, it helps to know about the bodyâs lymph system. Lymphoid tissue, also known as lymphatic tissue, is the main part of the immune system. It is formed by different types of cells that work together to help the body fight infections.
Observation Systems International Program. Demography, the science of human population (or more specifically, the study of population structure. and processes), draws together research from a number of disciplines, including economics, sociology, geography, public health, and genetics. In addition to the environmental impacts of.
Since Thomas Malthus' population predictions to Paul Erlich's forecast of the population bomb, people have been interested in the effects of population. Future trends in population size, age structure, births, deaths and other demographic variables are of interest to a wide range of analysts, specifically demographers. Demography is the study of the size, distribution and composition of a population and its components of change, which includes fertility, mortality and migration. Demographers study populations to determine the causes and consequences of changes in population size, distribution and structure. They plan and conduct research designed to study the characteristics of human populations, such as growth and structure.