Answer:
C
Explanation:
it is chemical, not physical
Answer:
I feel it's to easily differentiate the positive from the negative...... like in gram staining of bacteria, the colour tell us which bacteria is gram positive or gram negative...... I just feel that this is science and it is advisable to know what the opposite result of an experiment should look like.
The defining feature of a prokaryotic cell is C. Membrane- bound organelles.
I hope this helps! :>
