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.
Whale sharks are the target of commercial fisheries; this has put them on the list of endangered species. Although the worldwide population is unknown, the reduction in sightings has placed them in a vulnerable situation. According to information of 2016, there are about 7,100 whale sharks in the ocean. Links to other pages in this site.