We're in the midst of the Earth’s sixth mass extinction crisis. Harvard biologist E. O. Wilson estimated that 30,000 species per year (or three species per hour) are being driven to extinction.

Extinction occurs when there are no remaining individuals of a species alive. Animals that have not adapted well to their environment are less likely to survive and reproduce than those that are ...

To understand evolution, humans must think in much larger units of time than those we use to define our lives ... conditions in which life has evolved. Extinction Introduction: End of the Line ...