Houghton Mifflin Harcourt
Harcourt: School Publishers: Exploring Ecosystems
Compare and contrast three very different ecosystems - the Sonoran Desert in Arizona, the Florida Everglades, and the Arctic Coastal Plain in Alaska. Learn what makes each of them unique, and about the adaptations plants and animals had...
Smithsonian Institution
Smithsonian Marine Ecosystems Exhibit
Take an online tour of the Smithsonian's "Exploring Marine Ecosystems" exhibit. Learn about coral reefs and look behind the scenes as scientists maintain the model ecosystems.