Adaptations: Saccharomyces cerevisiae has adapted in several important ways. One is the fact that they are able break down their food through both aerobic respiration and anaerobic fermentation. They can survive in an oxygen deficient environment for a period. Another adaptation they have is their ability to have both sexual and asexual reproduction. Very few other Ascomycota can do both processes. And very few organisms can do all four of these processes. This allows this species to live in many different environments. (Madigan, 457)