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.
Sharks have been around for over hundreds of millions of years. While many of us may be familiar with a few shark species, there are over 400 of them, from the 8-inch-long dwarf lanternshark to the 40-foot-long whale shark.