TED Talks
Ted: Ted Ed: Why Wildfires Are Necessary
Our early ancestors relied on lightning to cause forest fires, from which they could collect coals and burning sticks to help them cook food and clear land. Yet, it wasn't just humans who benefited from these natural phenomena. Even as...
CK-12 Foundation
Ck 12: Life Science: 12.20 Succession
Understand primary and secondary ecological succession, and their importance to ecosystems.
CK-12 Foundation
Ck 12: Life Science: 12.11 Habitat and Niche
See how organisms each have their own role in the ecosystem.
CK-12 Foundation
Ck 12: Life Science: 12.9 Symbiosis
Learn about the many types of symbiotic relationships in an ecosystem.
CK-12 Foundation
Ck 12: Life Science: 9.18 Importance of Insects
Understand the ecological importance of insects, and why they are important to humans.
Other
Explore Learning: Estimating Population Size
Adjust the number of fish in a lake to be tagged and the number of fish to be recaptured. Use the number of tagged fish in the catch to estimate the number of fish in the lake. (Free usage is limited to five minutes per day.)