You leave mammalian cells in culture to incubate over a three-day period. Upon returning, you find that the culture has been contaminated with yeast, and a large number of mammalian cells have died as a result. You decide to create a model that describes the number of mammalian cells during the three-day incubation period. Note that this mammalian cell line has a doubling time, or the time necessary for the number of cells to double, of 1.5 days. (Please note that a Generation term can refer to self-generation or reproduction, and Consumption does not necessarily refer to actual consumption—it can mean death as well.)