[Free Registration/Login may be required to access all resource tools.] For a population to be healthy, factors such as food, nutrients, water and space, must be available. Limiting factors are resources or other factors in the...

This lesson unit guides students in developing strategies for modeling problems. The task focuses on investigating a cat shelter's claims about the rate of cat population growth. The unit includes a full lesson plan, examples of student...

The environment has recently been the focus of much research and discussion. Because productive resources are limited, it is important that we use resources wisely to ensure that resources will be available for use in future generations....