In the image to the left you see three human males. You can generate three pairings of these individuals. When comparing these pairs which would you presume are more closely related than the other ...

Evolutionary biologists like to say that mutations are random but that selection is not; species are crafted by their environments. But if this is the case, why is it so hard to predict evolution? A ...

Believed critical for determining which individuals can -- or cannot -- successfully reproduce with each other, genitalia not only figure prominently in the origin of new species, but are also ...

As far as evolution is concerned, genital size doesn't matter — but shape does. Genitalia are important in the evolution of new species, since compatible parts are necessary for two individuals to ...

BLOOMINGTON, Ind. -- Believed critical for determining which individuals can -- or cannot -- successfully reproduce with each other, genitalia not only figure prominently in the origin of new species, ...