Video explores the interdependence of two species to define the concept of symbiosis. [2:23] Followed by a short quiz and a list of additional resources to explore.

Our planet's diverse, thriving ecosystems may seem like permanent fixtures, but they're actually vulnerable to collapse. Jungles can become deserts, and reefs can become lifeless rocks. What makes one ecosystem strong and another weak in the face of change? Kim Preshoff details why the answer, to a large extent, is biodiversity. [4:19]

In this tutorial students can learn the definition of species, how new species evolve, and the processes that can cause new species to arise. At the end of the tutorial students can take a quiz to evaluate what they learned about speciation.

Learn about the scientific hypotheses of the origin of life on Earth. [5:55]

This activity is a teacher-guided inquiry activity of the sorting or grouping of Minnesota critters according to student driven criteria or purpose of their groupings. Teacher/student questions and discussion should be encouraged after this activity to emphasize that awareness of the criteria or purpose of certain groupings may be important before beginning an investigation.

Understand how variation can be introduced into a species. [19:52]

Khan Academy learning modules include a Community space where users can ask questions and seek help from community members. Educators should consult with their Technology administrators to determine the use of Khan Academy learning modules in their classroom. Please review materials from external sites before sharing with students.

In this video, students examine the role of vultures as scavengers, and explore the link between the vultures' niche and human health in India. [4:40]

This lesson helps grade 3 students understand the difference between Vertebrates and Invertebrates.

Students experience civil and environmental engineering by planning a housing development in an existing biome, while also protecting the native species that live there. They conduct research, draw plans, make brochures and give presentations, with each team having a member serving as a project manager, civil engineer, environmental engineer and graphic designer. The best designs creatively balance the needs and resources necessary to support both the native species and human infrastructure.

The Dutch version of the World Nature Fun's Ranger Club children's site. Students learn about endangered animals in different habitats, obtain pictures through the animal library and play games. Some sections of the resource offer paid membership subscriptions and more in-depth literature.

Students perform a macroinvertebrate survey to gauge the health of a local river. They collect water samples and count macroinvertebrates to learn how the health of a river's ecosystem can be determined by its river insect population.