What is a shark?
Selachimorpha is a superorder of the Infraclass Euselachii. (1)
Selachimorpha are also known as sharks. (1)
Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. (1)
A shark is a type of big fish. (2)
What are orders of sharks?
Carcharhiniformes (1)
Heterodontiformes (1)
Hexanchiformes (1)
Lamniformes (1)
Orectolobiformes (1)
Pristiophoriformes (1)
Squaliformes (1)
Squatiniformes (1)
Sharks and Humans
The EPA recommends to eat shark only a few times per month (2)
Resources
1. https://en.wikipedia.org/wiki/Shark
2. https://en.wikipedia.org/wiki/Mercury_in_fish#/media/File:MercuryFoodChain.svg
