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.
According to the International Union for the Conservation of Nature Shark Specialist Group, 28 percent of shark species are at risk of extinction. An estimated 100 million sharks are killed annually, Worm and other researchers estimate, 20 million or more per every fatal shark attack. And that wholesale slaughter could already be sending dire consequences cascading down the food chain, much to the bane of scallop and lobster lovers.