5.+Ecology+and+Evolution

5. Ecology and evolution - 5.1 Communities and ecosystems - 5.2 The greenhouse effect - 5.3 Populations - 5.4 Evolution - 5.5 Classification - Ecology and Evolution Labs

The Crash course in Ecology is a great way to start understanding this topic (with the exception of 5.4). There's 12 videos and it takes time to watch them, but they should give you a good understanding of the topic. Great viewing before attending the fieldtrip.