Did all animal life on Earth begin with a sea sponge? - CSMonitor.com

http://www.csmonitor.com/Science/2016/0226/Did-all-animal-life-on-Earth-begin-with-a-sea-sponge?cmpid=ema:nws:Science%2520Weekly%2520%2803/03/2016%29&utm_source=Sailthru&utm_medium=email&utm_campaign=20160303_Newsletter:%20Science&utm_term=Science_final