Which one of the following is a simple lipid? 
Definitions:
External Validity
The degree to which the results of a study can be generalized to other situations, populations, or time periods outside of the study conditions.
Sensitizing Effects
Changes in behavior or responses due to participants becoming accustomed or sensitized to the experiment or its conditions.
Within-Subjects Designs
Experimental design in which the same participants are exposed to all conditions or treatments, allowing direct comparison of responses across conditions.
Order Effects
The impact of the order in which treatments, tasks, or stimuli are presented on the participants' responses in an experiment.
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