Nvironment factors affect evolutionary change

How do environmental factors affect evolutionary change? Use the EvoTutor simulation to look at different types of natural selection and the influence of variation on natural selection. Go to TutorA.html and click on the selection link. Explore information under variation, and heritability mode links. Under each of these tabs click on Simulation and then click Run. What do you learn as you vary parameters in each simulation of Variation and Heritability