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Ans: A taxon is used to refer to a level of the biological classification such as order, phylum family, etc.
In the taxonomy, the different taxa are assigned their levels, and they follow a certain order that cannot be changed. For example, a species always follows up after a genus, and this order cannot be reversed.
Flow diagram from the lowest category to the highest category for plants and animals are given below:
Plant: Kingdom
Division 
Class 
Order 
Family 
Genus 
Species
Animal: Kingdom
Phylum 
Class 
Order 
Family 
Genus 
Species
As we go up the taxonomical hierarchy, the number of shared characters reduces as the level of classification decreases. For example, the number of shared characters of a species will be more than the number of shared characters for a family.
As we go up the taxonomical hierarchy, the classification decreases and thus, the number of individuals increases.