This document discusses the use of Stella software for modelling and simulation in biology. It provides examples of using Stella to model relationships between owl population, rat population, and palm production over 24 years. Figures 1-4 show graphs of these relationships when rat population is 5,000, 10,000, 20,000, and 30,000. Table 1 further summarizes the data. The document also discusses benefits of modelling and simulation in the learning process, like accelerated and safe learning. While software costs and training requirements are disadvantages, overall simulation and modelling can help students learn deeply and boost motivation.