How predatory plankton created modern ecosystems after 'Snowball Earth'

Around 635 to 720 million years ago, Earth was twice almost completely covered by ice. The question of how life survived these 'Snowball Earth' glaciations has puzzled scientists for many decades. Researchers have now found the first detailed glimpse of life after the 'Snowball' in the form of newly discovered ancient molecules, buried in old rocks.

from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/02/190201114135.htm