Answer:
He has one and a person has two. A citizen has three. And a human being has four. A personality has five. And an inhabitant of earth has six.
What can be underwater, under fire, on fire and taking water all at the same time?
Runs smoother than any rhyme, loves to fall but cannot climb!
I am nothing but holes tied to holes, yet am strong as iron.
My first is in some but not in all. My second is into but not in tall. My third in little but no in big. My fourth in port but not in pig. My whole is made in nature's way. For clothing, rugs used every day.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.