[Free Registration/Login may be required to access all resource tools.] Describes the different roles in an ecosystem.

[Free Registration/Login may be required to access all resource tools.] Describes the different roles in an ecosystem.

[Free Registration/Login may be required to access all resource tools.] Describes various types of hazardous waste.

[Free Registration/Login may be required to access all resource tools.] Describes how energy is transferred from one organism to another.

[Free Registration/Login Required] A 2nd grade unit on animal environments and habitats. Include web links for information on different land and water habitats, as well as a lesson on food chains.

This overview of feeding relationships illustrates to students the trophic levels of different organisms in an ecosystem. Hover the mouse over different terms to see their definitions.