Epidemiologists study outbreaks of diseases, the causes, locations, and how various communities are affected, utilizing relative information to aid in the prevention of future outbreaks. Epidemiologists help to keep the public informed of methods to maintain and improve public health.
Based on these criteria, the smallest known extant shark species appears to be Etmopterus perryi, males of which mature at 16 to 17.5 cm TL and gravid females have been found at 19 to 20 cm TL (Springer & Burgess 1985).
The world's most dangerous shark is the Bull Shark. The world's biggest shark is the Whale Shark (a shark is a fish). The Whale Shark can be up to 53 feet long and weight more than 13 ton.(The Blue Whale is a mammal that is why it is not the biggest fish.).The world's fastest shark is the Mako Shark.he world's most dangerous shark is the Bull Shark. The world's biggest shark is the Whale Shark (a shark is a fish). The Whale Shark can be up to 53 feet long and weight more than 13 ton.