[" 1.Discuss how classification systems have undergone several changes over a "],[" period of time? "]

Discuss how classification systems have undergone serveral changes over period of time.

Assertion: Classification systems have undergoes several changes over a period of time. Reason: This happened, because the criteria for classification get changed gradually.

Why are classification systems changing every now and then ?

Why are the classification system changing every now and then?

Why are the classification systems changing every now and then?