Question

what is the primary characteristics on which the first division of organism is made​

Answer 1

by Nature of cell

It is considered to be the fundamental characteristic for Classifying all living organisms. Nature of the cell includes the presence or absence of membrane-bound organelles.

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Answer 2

The primary characteristics on which the first division of organism is based on whether the cells occur singly (unicellular) or they are grouped together and function as individual group (multicelluar).