
Evolutionary innovations--the bony skeleton of vertebrates, avian flight, or the insect pollination system of angiosperms, for example--have in recent years become the focus of much fertile new research in evolutionary biology. Innovations may hold the keys to understanding why...

Evolutionary innovations--the bony skeleton of vertebrates, avian flight, or the insect pollination system of angiosperms, for example--have in recent years become the focus of much fertile new research in evolutionary biology. Innovations may hold the keys to understanding why...