Adopted in 1965, Ontario's flag features three of which leaves?

Adolphe Adam's masterpiece is the music for which 1841 ballet, in which the title girl rises from her grave to dance? Who is Barney and Betty Rubble's adopted baby son? Adopted by international agreement in 1906, which became the standard radio distress signal? Adopted in 1929, the flag of which independent state includes the keys of heaven? Which Middle Eastern nation adopted a flag in 1980 with "Allahu Akbar" written 22 times along its stripes? Adopted in 1994, the flag of which African nation reflects its racial and ethnic diversity? Adopted in 2005, pan de campo is Texas's official state what? Adopted in March 1861, which document was modeled on the U.S. Constitution?