→ All living organism are grouped on the basis of their similarities and increasing complexities into different complexities.

Chapter 13 Diversity of Life and Classification - Frank Modern Certificate  Solutions for Class 9 Biology ICSE - TopperLearning

→ Biodiversity means the variety of living organisms present on a particular region.
→ There are about 20 lac organisms known on the earth which differ from one another in externaform, internal structure, mode of nutrition, habitat, etc.
• Taxonomy:
It is a branch of biology which deals with identification, nomenclature andclassification of organisms.
Carolus Lannaeus is called the father of taxonomy.