A fertilizer dearth foiled animal evolution for eons?

A fertilizer dearth foiled animal evolution for eons? 12/29/2016 09:34 AM EST Earth was inhospitable to complex life for billions of years, practically suffocating evolution in a nearly oxygen-free environment. Then came a shift in phosphorus concentrations to ocean shallows, and after that, the evolution of complex life exploded. Full story at http://www.news.gatech.edu/2016/12/21/fertilizer-dearth-foiled-animal-evolution-eons Source Georgia Institute of Technology This is an NSF News From the Field item.   Follow NSF:  This email was sent using GovDelivery, on behalf of: National Science Foundation Update · 4201 Wilson Boulevard · Arlington, VA 22230 · 703-292-5111