The gas which is known as the laughing gas

Bio diesel is mainly produced from

The stomach of a man daily produces hydrochloric acid around:

The helium content in the air:

Cloudy nights are warmer as compared to clear cloudness nights because clouds.

A man whose blood group is not known meets with a serious accident and needs blood transfusion immediately. One of the following blood groups mentioned below and readily available in the hospital will be safe for transfusion. That is