The criterion NOT used to define a prokaryotic species is that members of different species cannot interbreed.
A prokaryotic species is that species which is a single celled organism and does not possess nucleus or other membranes.
Example of a prokaryotic species is Amoeba.
Interbreed refers to the breeding between two different races.
like: cross a horse and a donkey to get a new breed as Mule. Aslo breeding between different species of same genus.
Hence, the criterion NOT used to define a prokaryotic species is that members of different species cannot interbreed.
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