Trace metals in the sea turned the course of the earth's history. A nickel starvation that occurred billions of years ago gave rise to the dominance of oxygen, says S Ananthanarayanan
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/when-nickels-fall-gave-birth-life
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/deccan-herald-bangalore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nickel
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/life-science