Based on the clue 'a cell formed by the union of 2 gametes', what is the answer?

Based on the clue 'a cedar tree is featured on this countrys coat of ...', what is the answer? Based on the clue 'a cedilla circumflex or macron are these marks', what is the answer? Based on the clue 'a celebration to mark at 10 decade anniversary', what is the answer? Based on the clue 'a celesta is one of these struck by hammers', what is the answer? Based on the clue 'a cellini masterpiece shows this greek hero holdin...', what is the answer? Based on the clue 'a center of egypts rice trade this nile delta city...', what is the answer? Based on the clue 'a center of tulip growing this dutch city gave its...', what is the answer? What is associated with: a centerpiece of the 1962 worlds fair this tower had science fiction art a german tv tower as…