Question

what is the primary characteristic for classifying organisms?​

Answer 1

The major characteristics considered for classifying all organisms into five major kingdoms are:

whether they are made of prokaryotic or eukaryotic cells.

whether the cells are living singly or organised into multicellular and thus complex organisms.

Answer 2

Answer:

The advanced organisms will be the same as complex organisms. This is because there is a possibility that complexity in design will increase over evolutionary time.