The criteria for classification are changing over time. Why?

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

Explain briefly how the methods of classification changes over time

Which are the criteria used for classification of plants and animals?

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

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

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

On which criteria early classification was based?