Chapter Five (Sarah)

There are many hypotheses about mass extinction. One of the many that is talked about the most is how an asteroid killed the dinosaurs. The most interesting theory to me is the one about the Nemesis since it would be hard to image there was a "death star" that rains down comets every twenty- six million years. If there was, I wonder when the next mass extinction would happen and what animals and plants would go extinct.

In this chapter, Zalasiewicz describes rats as very adaptable sine they've survive for along time even in environments they didn't originate from. This makes me curious since in the previous chapter Taylor says that during a major extinction the rules of a specie's survival can change drastically. So, would there be a condition where rats would have a hard time surviving in and no longer be able to adapt in?