useless trivia: What Word Means: A Piece Of Armor Below The Breastplate?

Questions

In the ABO system, which blood type is the universal recipient?

What kind of construction are both the Sydney Harbour and the Runcorn-Widnes bridges?

In the system of linear measurement, how many yards are there in one chain?

Which was the last port of call from which the Titanic sailed?

Which planet is nearest in size to that of the Earth?