Heating, stirring/shaking, and exposing more surface area(making the pieces..?

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

Around the third week of a college class, a professor decides she’s had enough, is tired of dealing with bureaucracies, and wants out. so one day, instead of coming to class, she flies to tahiti and sells souvenirs on the beach. if this happened, the college would simply assign a substitute to finish the course. what does this tell you about the nature of the authority wielded by a professor?

What is the cause of their extinction