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.
Most sharks live in saltwater, but a couple of species â bull sharks and river sharks â can live in freshwater or saltwater. Unfortunately, many shark species are under attack and are decreasing in numbers every year. Experts estimate that 100 million sharks are killed by people each year.