Annenberg Foundation
Annenberg Learner: The Habitable Planet: Unit 9: Biodiversity Decline
This is an extensive learning module on biodiversity and its decline. It looks at ways biodiversity is threatened, the possibility of another mass extinction, the causes and consequences of habitat loss, factors that drive biodiversity...
CK-12 Foundation
Ck 12: Biology: Human Actions and the Sixth Mass Extinction
[Free Registration/Login may be required to access all resource tools.] Describes how human actions are resulting in a sixth mass extinction.