CK-12 Foundation
Ck 12: Life Science: Importance of Birds
[Free Registration/Login may be required to access all resource tools.] You are probably familiar with birds as food. Around the world, people consume chicken, turkey, and even more exotic birds, like ostriches. Can you think of other...
Annenberg Foundation
Annenberg Learner: The Habitable Planet: Ecosystems: Energy Flow Through
Detailed explanation of the processes by which energy flows through an ecosystem. Scroll down and open Section 3.
Khan Academy
Khan Academy: Ap Us History: 1890 1945: The Age of Empire: The Progressive Era
The Progressive Era from the 1890s to the 1920s evolved as a response to the negative effects of industrialization. Reforms that emerged provided protections for workers and consumers and gave women voting rights. Backlash against the...
PBS
Nh Pbs: Nature Works: Ecosystems
How would you define an ecosystem? Check out this educational resource to learn more about the living and nonliving parts of different ecosystems.