Breeding of nitrogen-resistant Taumoeba-80

Grace and Rocky discover that natural Taumoeba are killed by the nitrogen present in the atmospheres of Venus and Threeworld. To overcome this, they embark on a selective breeding program, gradually exposing Taumoeba to increasing levels of nitrogen. After many generations, they successfully create a strain, Taumoeba-80, that can survive the nitrogen levels found on Venus. This engineered predator is the key to saving both Earth and Erid, as it can be deployed to consume the Astrophage on their respective breeding planets.