Which structure of the respiratory system is the site of gas exchange?

Which number shows the location of the united kingdom of great britain? 7 5 2 4

Name the river that forms a natural border between new york and new jersey and is the site where a passenger jet made a miraculous landing on january 15

I’m his published 95 theses,martin luther protested against? a-the selling of indulgences within the catholic church b-the belief in predestination c-the worshipping of statues of saints d- the catholic church focus on faith as the sole means of salvation