A new type of pain reliever is administered to 30 consenting post-operative patients in various hospitals.Although the pain reliever has already been tested for safety and effectiveness,this experiment is to observe and categorize any side-effects.Because of maturity and body mass,it is decided to test the adults separately from the children. 
The grouping of the adults separate from the children is an example of what?
Definitions:
Amnesia
A loss or disturbance of memory, often due to brain injury, disease, or psychological trauma, impairing the ability to recall past experiences.
Conceptual Hierarchies
Structures that arrange knowledge and concepts from the most general to the most specific.
Species
A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.
Source Monitoring
The process of determining the origins of our memories, knowledge, or beliefs.
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