Which of the labeled regions in the diagram is the zona reticularis, which releases hormones that have a similar function to the hormones released by the male gonads? 
Definitions:
Independent Variables
Variables in an experiment that are manipulated or changed by the researcher to observe their effect on dependent variables.
Counterbalanced Crossover Design
An experimental design where participants are exposed to multiple conditions in a sequence that is randomized to control for the order effects.
Posttest
An evaluation or test conducted after the completion of an educational or training program to measure what participants have learned.
Treatment Order
involves the sequence in which experimental treatments are administered to participants, particularly relevant in studies with multiple interventions.
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