23 July 2015
Measurements of iron speciation in ancient rocks were used to construct the chemistry of ancient oceans. Analysis suggests that it took less oxygen than previously thought to trigger the appearance of complicated life forms.img src=”http://feeds.feedburner.com/~r/sciencedaily/~4/UxF7vz3ziI8″ height=”1″ width=”1″ alt=””/
http://feeds.sciencedaily.com/~r/sciencedaily/~3/UxF7vz3ziI8/150723125615.htm
