The word biodiversity is a contraction of biological diversity. It is commonly used to describe the number variety and variability of living organisms. This very broad usage embracing many different parameters, is essentially a synonym of LIFE ON EARTH.

1. The whole world has wide variety of living organisms we can see both invisible (microbial) and the visible world around us are diverse.

2. Different microorganisms like algae, fungi, bacteria, viruses etc., and also the micro-arthropods. There is diverse among microbes. 

3. There are different variety of plants like grass, herbs, shrubs, creepers, trees etc. Among the individuals also there are variations like height, colour and size of flower and fruits. 

4. We find variations in animals even though they are similar kind. We find differences in colour of fur, nails, claws or hoofs etc. 

5. Among birds we can see variations in their feathers, feet, crown, tail etc. 

6. As all the humans belong same genus but there is variation in their hands, fingers, toes, nails and hair, height and shape. We can even see variation in the texture of skin dry, oily, smooth or rough. Whether they are twins also we can find variations among them.