The term was then exported with Prussian officers and nobles to Russia. The Feldsher system of rural primary care provided some of the inspiration for China's barefoot doctors. Today feldshers can be found in every medical setting from primary to intensive care. They are often the first point of contact with health professionals for people in rural areas.
1 The prospect of a food chain minus its apex predators may mean the end of the line for many more species. 2  Sharks have widespread global distribution, are highly migratory and play a vital role in maintaining the health of ocean ecosystems.
The skin of a shark is made of tiny denticles, which are made of the same enamel that teeth have, meaning they too can fossilize. Some more primitive sharks have spines in their fins that will fossilize. Finally, shark feces, or coprolites, are sometimes found preserved.