Please help, this is for my American history/social studies class

Rank the following from most to least devasting: ordovician,permaian,cretaceous, pleistocene

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?

In a communication, the media needs to be shared between devices