Associated Press: The oil you can’t see could be as bad as the oil you can. While people anxiously wait for the slick in the Gulf of Mexico to wash up along the coast, globules of oil are already falling to the bottom of the sea, where they threaten virtually every link in the ocean food chain, from plankton to fish that are on dinner tables everywhere. “The threat to the deep-sea habitat is already a done deal — it is happening now,” said Paul Montagna, a marine scientist at the Harte Research …