It would be the root word "C. Ambi-" that means “more than one”, since this is often used in the English language in words such as "ambidextrous"--meaning to have full use and ability in both hands.
The US navy was founded by two people- John Paul Jones and John Barry back in October 13, 1775 in PA.
It promoted the (relatively) rapid diffusion of immigrants, language, and domesticated crops and animals. Those factors are examined in excellent detail in Jared Diamond's book, "Germ, Guns and Steel" which I highly recommend for anyone studying the development of world cultures. It's a long read, but well worth it.
Something scarce is something that is not found easily. It is sometimes limited therefore it is RARE.
Your answer would be rare. :) Hope I helped. :D