The number of groups that Aristotle use to divide all of the organisms in the world is 2.
The number of group that Aristotle use to divide all of the organisms is two and this number of groups can be classified as the Plants and Animals.
It should be noted that this was done about 2500 years ago while Aristotle classified living organisms as plant which are the green plants around us that we see everyday, as well as the organisms which also includes the microorganisms around us.
Therefore, the second option is correct.
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