At the urging of environmental groups, a U.S. judge threew out an assessment by a federal agency governing how endangered and threatened marine species should be protected from oil and gas drilling in the Gulf of Mexico.U.S. District Judge Deborah Boardman in Greenbelt, Maryland, ruled the U.S. National Marine Fisheries Services' so-called "biological opinion" was flawed and did not adequately address risks species face from oil spills and vessel strikes.The assessment was issued…