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.
There are 2 pores on the top of a shark's head called endolymphatic pores, which connect to the shark's inner ear. Sharks have good directional hearing. They are sensitive to low frequencies, and can hear up to a kilometer away. Some sharks feel their prey move around them. They can sense a lot of things. Sharks actually have no external ears. They have internal ears that are also used for balance and equilibrium. There are 2 pores on the top of a shark's head called endolymphatic pores, which connect to the shark's inner ear. Sharks have good directional hearing.