This morning we discussed the fragility of ecosystems and observed how removing a species can have large effects. Arianna learned about the sardine fishery collapse: https://youtu.be/fLRCxX1uRPk and it's eventual recovery due to conservation efforts. Arianna asked a wonderful question at the end of the session that we will discuss tomorrow: "When dinosaurs like the T-rex went extinct, was there an effect on the ecosystem?"