Which team returned to the Super Bowl in Super Bowl LIV for the first time in 50 years?

Which team did the New York Giants defeat in Super Bowl XLVI? Which team did the San Francisco 49ers defeat in Super Bowl XXIX? Which team did the St. Louis Rams defeat in Super Bowl XXXIV, stopping them one yard short on the final play? What is the famous final play of Super Bowl XXXIV called, when Mike Jones tackled Kevin Dyson at the 1-yard line? Which Bengals quarterback led Cincinnati to Super Bowl LVI? Which Falcons quarterback, the 2016 NFL MVP, started Super Bowl LI? Which Panthers quarterback, the 2015 NFL MVP, started Super Bowl 50? Which Seahawks quarterback won Super Bowl XLVIII in his second NFL season?