Yuan is the currency of which country?

Where was the atomic bomb thrown for the first time?

Is the ozone layer found?

What was the cause of Minamata disease?

I.U. C. N. Into how many classes are the major threatened organisms classified by?

Apart from hydrogen, which element is found in abundance on the surface of the Sun?

The Natural rubber is a polymer of

Which one of the following elements is used in the manufacture of fertilizers?