Our analysis of production and cost begins with a period economists call the short. run. Theshort run in this microeconomic context is a planning period over which the. managers of a firm must consider one or more of their factors of production as fixed.
Sharks have two sets of paired fins on the sides of their body, in the same general position as the main wings and horizontal tail wings of a plane. The shark can position these fins at different angles, changing the path of the water moving around them.
1 Sharks, skates, and rays are collectively termed Elasmobranchs, which are a subclass of Chondrichthyes, or the cartilaginous fishes. 2  The largest shark is the Whale shark which can reach up to 40 feet in length.earn about sharks and opportunities to see them in the wild including whale sharks, hammerheads, and others.