Based on the clue 'at about 600 miles in diameter ceres is the larges...', what is the answer?

Based on the clue 'at about 417 pm edt the world heard him say housto...', what is the answer? What is associated with: at about 43000 square miles its the largest independent island nation in the western hemispher… What is associated with: at about 440 square miles red lake is the largest of this states 10000 lakes? Based on the clue 'at about 500 pounds the pygmy species of this is o...', what is the answer? Based on the clue 'at about 63 there are more atoms of this element t...', what is the answer? What is associated with: at about 63000 ft at normal body temperature blood will do this? Based on the clue 'at about 7 million this iranian city is the middle...', what is the answer? What is associated with: at about 9 feet 1700 pounds this large bear shares its name with an alaskan island?