If your floor really needs more than that, consider a low-cost alternative to refinishing: Apply a fresh topcoat of nonyellowing polyurethane, found in the flooring section of a home improvement store. Be sure to very lightly sand the floors with a pole sander and fine-grit sandpaper.
There are 440 different species of sharks in the world today classified into eight different orders described below with some examples of known sharks species for each group.
OK if someone tells you how many sharks are in the world they are lying. Oceans+Seas are twice larger than the landmass on this planet and most of it is still unknown to man. So there is no way in hell that anyone could know how many sharks are in the water. @@@@. If you mean how many different species of shark then: