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.
Anatomy: This shark grows to 4 feet (1.2 m). It has a blunt head, and above each eye is a large knob. There is a small spiracle behind and below each eye; they are used for respiration. This shark has black stripes that give it its name. There are 2 large dorsal fins (each with a spine).