Glacial episodes are an example of a. positive feedback b. negative feedback c. the “daisy model” d. the gaia hypothesis

This is a positive feedback. These episodes make the next glacial period even more severe and long-lasting than the one prior. This is due to the reflectance of the surface of the land having a positive relationship with how much energy is absorbed: as the reflectance increases, absorption decreases, and the glacial period increases in severity.