A researcher wants to test if juvenile hormone (similar to testosterone) is associated with aggression in paper wasps. The researcher films wasp interactions between wasp pairs in which one individual is given extra juvenile hormone. The researcher also films wasp interactions between pairs in which neither individual is given extra testosterone. Filming conditions are the same for each pair and the level of aggression is recorded. What is the control in this experiment?
a. The pairs in which one individual is given extra juvenile hormone is the control.
b. The pairs in which neither individual is given extra juvenile hormone is the control.
c. There is no control; this is an observational study.
d. The similar filming conditions is the control.
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