Why are the classification systems changing every now and then?

Assertion :- Classification systems are changing overynow and then. Reason :- Over time, criteria for classification changed.

Three domain classification.

Discuss how classification systems have undergone several changes over a period of time?

Discuss how classification systems have undergone several changes over a period of time ?

Chlamydomonas and Amoeba are classified in kingdom protista according to Whittaker's classification system but by earlier classification system both these organisms are classified in different kingdoms (True/False)