[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.] Discusses how autotrophs and heterotrophs obtain energy.

[Free Registration/Login may be required to access all resource tools.] Describes the function of various structures in mammals.

[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.] When an herbivore eats a plant, the energy in the plant tissues is used by the herbivore. Every time energy is transferred from one organism to another, there is a...

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

This unit shows how ecosystems change over time and how matter and energy, which are essential to its operation, are transformed and passed from one living thing to another forming, in some cases, authentic cycles. It contains 19...

This is a teacher's guide to a lesson on ecosystems. The objective is for the students to set up their own ecosystem and define the roles of producers, consumers and scavengers.

A comprehensive ecology learning module where students assess the dependence of all organisms on one another and the flow of energy and matter within their ecosystems.

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.

Read and fill in the blanks of this passage explaining who eats what. Each blank has a dropdown menu with choices. When you finish, click CHECK MY ANSWERS. If you pick a wrong answer, the right answer will be displayed along with your...

This concise site that provides an explanation of what producers are along with a short quiz to test your knowledge of producers and consumers.