Mixture of Potassium Nitrate Powdered Charcoal and Sulphur is called

Different groups of plants are Herbs, Shrubs and ?

Animals are divided into how many sub groups?

The organisms which have back bone in their body are called

Rod shaped bacteria are called

Influenza Measles, Chicken pox, Polio, Hepatitis and Aids are caused by:

How many layers does Earth’s atmosphere have?