Diversity in living organisms 
Every living organism is unique and this uniqueness is the basis of the vast diversity displayed by the organisms in our world.
This huge diversity is the result of evolution, which has occurred over millions of years.
The massive biological diversity can only be studied by classification i.e. arranging organisms into groups based on their similarities and differences.
Different characteristics are used to determine the hierarchy of classification.
The primary characteristics that determine the broadest divisions in classification are independent of any other characteristics. The secondary characteristics depend on the primary ones.
This huge diversity is the result of evolution, which has occurred over millions of years.
The massive biological diversity can only be studied by classification i.e. arranging organisms into groups based on their similarities and differences.
Different characteristics are used to determine the hierarchy of classification.
The primary characteristics that determine the broadest divisions in classification are independent of any other characteristics. The secondary characteristics depend on the primary ones.