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.
Unlike most other animals and fish, the inside of a shark's mouth has several rows of teeth lining the jaw. Depending on the species, they may have anywhere between 5 and 15 rows consisting of hundreds of teeth. Now, it's important to note that when a shark loses a tooth, the one behind it comes it to take its place. This process doesn't happen instantly, but it usually replaces it within 24-48 hours.