And if you're going to say, "I'm going to stop talking about selective pressures," you can take "The Origin of Species" and throw it out of the window, for it's about nothing else but selective pressures.
Y si ustedes dicen: "Ya no voy a hablar de presiones selectivas", pueden agarrar "El origen de las especies" y lanzarlo por la ventana. Pues trata precisamente de presiones selectivas.