Radiological studies as well as endoscopic procedures are unnecessary in the early management of these patients thus being relegated to recurrent or persistent bleeding. 1  Bonita F. Stanton; Kliegman, Robert; Nelson, Waldo E.; Behrman, Richard E.; Jenson, Hal B. (2007).
Geography can be either a natural or social science; if you are studying the physical structure of the Earth, such as the locations of bodies of water, mountains, rivers, deseâ¦rts, etc., that is a type of natural science, and if you are studying national borders and political divisions marked on a map, that is a type of social science.
Validity, accuracy, and social mechanisms ensuring quality control, such as peer review and repeatability of findings, are amongst the criteria and methods used for this purpose. Natural science can be broken into two main branches: life science (or biological science) and physical science. Physical science is further broken down into branches, including physics, astronomy, chemistry, and Earth science. All of these branches of natural science are divided into many further specialized branches (also known as fields), and each of these is known as a natural science.