: Ecology of Organisms Time: 1 hour (plus 2 hours observation time) Learning Objectives: Associate physical and geographic limitations with population dispersal; Apply the concept of tolerance to species survival; Relate ecological interactions to predator-prey dynamics LABSLabs.jpg Experiment 1: Yeast’s Response to Pollution Students expose yeast to various chemicals to understand how pollution can affect the respiration of yeast, as verified by a pH indicator. Please click here (Links to an external site.) to download the Pre-Lab Questions. Please click here (Links to an external site.) to view the Experiment 1: Yeast′s Response to Pollution procedure. Please click here (Links to an external site.) to download the Experiment 1: Yeast′s Response to Pollution Post-Lab questions. Experiment 2: Owl Pellet Dissection Students probe an owl pellet to learn more about the ecological interactions and ecosystem of the animal. Please click here (Links to an external site.) to view the Experiment 2: Owl Pellet Dissection procedure. Please click here (Links to an external site.) to download the Experiment 2: Owl Pellet Dissection Post-Lab questions.