An overview of the mass extinctions throughout earth history. Each mass extinction has a link to its own page with a list of its possible causes and the species that were most affected.

There are five major causes of extinction: habitat loss, an introduced species, pollution, population growth, and overconsumption. Through this activity, students will create a list of reasons why animals can become extinct.

How do endangered species and animals become extinct? Hunting, pollution, loss of habitat, and introduced species all play a part and are discussed on this site.

This comprehensive study guide covers the main terms and concepts needed for a unit on the biodiversity crisis.

[Free Registration/Login may be required to access all resource tools.] How does genetic variation protect species from extinction? Understand sexual reproduction and the importance of both random fertilization and independent assortment.

One subspecies of the White-eared Pocket Mouse may be extinct, and the other is extremely rare, consisting of isolated, relict populations near the western Mojave Desert in California. White-eared Pocket Mice are nocturnal and probably...