Since polystyrene disintegrates slowly, one of the main challenges that it poses on the environment is that exposure to the sun causes it to photodegrade, meaning it breaks apart into smaller and smaller pieces. The broken down material ends up looking like food to small animals.
United States Congress elections, 2016. A total of 469 seats in the U.S. Congress (34 Senate seats and all 435 House seats) were up for election on November 8, 2016. The big story of the 2016 congressional election cycle was whether or not the Democratic Party would be able to regain control of the Senate.
You get to vote for both. But generally not in the same election. Individual senators are up for election every third 2 year cycle of the House of Representatives (thus, every six years). Roughly one third of the senate is up for election every two years. As far as I know, all states stagger their two senate election cycles.