Curated OER
Establishing a Baseline Ecology of a Creek Ecosystem
Students investigate the physical, chemical and biological parameters necessary to establish an ecological baseline. Establishing an ecological baseline not only shows the ecological characteristics of a creek but makes the possible...
Nature Conservancy
The Nature Conservancy: The Importance of Biological Interactions
Organisms have a variety of relationships. For this lesson, students learn to categorize relationships according to their impact on organisms and the terminology for these biological interactions.
CK-12 Foundation
Ck 12: Biology: Interdependence of Living Things
[Free Registration/Login may be required to access all resource tools.] Covers interactions between organisms.