National Geographic
National Geographic: Symbiotic Relationships in Marine Ecosystems
In this lesson students analyze videos to make observations about species, populations, and communities of organisms and discuss their symbiotic relationships. Then they create a hypothetical marine ecosystem and describe the adaptive,...
University of Michigan
University of Michigan: The Concept of the Ecosystem
Lesson looks at the definition of an ecosystem, biogeochemical cycles, and factors responsible for the differences between ecosystems.