On Origin of Species
How, If, and Why Species Form
Tim Rogers, Alan J. McKane, Axel G. Rossberg | Nov 1, 2013
Biologists have struggled for centuries to properly define what constitutes a “species.” They may have been asking the wrong question—many smaller organisms might not form species at all.
Fighting to exist
Jef Akst | Jun 14, 2011
The more closely related two species are, the more they're apt to drive one another to extinction.