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.
The spiny dogfish has a double dorsal fin. The anterior dorsal fin is larger than the posterior dorsal fin. The spiny dogfish has the presence two spines, one immediately in front of each dorsal fin.The spines carry a poison secreted by glands at their base.The caudal fin is divided into two lobes: a larger dorsal lobe and a smaller ventral lobe.xamine the side view photographs of the spiny dogfish shark by clicking the blue lettered links in the column to the right. The shark has a graceful and streamlined body shape built for fast, long distance swimming. The body is divided into the head, trunk, and tail.