This morning we departed from our study of cellular mitosis and began our study of ecosystems and natural selection. We will continue to develop this idea by breeding Chinese preying mantis over the course of the next few weeks while looking at a variety of relationships from symbiosis to mutualism. We will also be looking at the video series "Strange Days on Planet Earth" that provides excellent case studies on how ecosystems can be negatively impacted by the arrival of invasive species.