Cuales son las etapas del panamericanismo

What would a student most likely use if he or she wanted to consult a secondary source

Which of the following discoveries would be most likely to cause a scientific paradigm shift? a. the discovery of more rings around uranus b. the discovery of a new pathogenic virus transmitted by mosquitoes c. the discovery that a dormant volcano is showing signs of activity d. the discovery of a new species of salamander in the amazon rainforest e. the discovery that excess heat is radiating from the center of the earth and causing global climate change

Experiment to investigate effect of medication on levels of stress in males and females. dependant variable?