A Researcher Observed Variation in Plasma Testosterone Hormone Levels in Birds

question 15

Multiple Choice

A researcher observed variation in plasma testosterone hormone levels in birds that was associated with variation in aggression: birds with higher levels of testosterone were more aggressive. In addition, experimental addition of testosterone increased an individual's level of aggression. Which of the following is correct about this work?

• A) It is a proximate explanation of behavior
• B) The results contradict Morgan's canon
• C) An ethogram of this species should include testosterone level
• D) It builds on the work of Ivan Pavlov
• E) It exemplifies the comparative method

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