Sentences with phrase «ocean at that early date»

Organisms, including the single - celled bacteria living in the ocean at that early date, need a steady supply of phosphorus, but «it's very hard to account for this phosphorus unless it is eroding from the continents,» says Aaron Satkoski, a scientist in the geoscience department at the University of Wisconsin - Madison.

Not exact matches

Shen's own work demonstrates that the deeps of the Proterozoic ocean were full of sulfidic gases, not dissolved oxygen, and indicates that a complex natural environment, complete with a food chain and natural selection, was in place on Earth at an early date.

Alternatively, the deep - ocean model data that was used in Forest 2006 may differ from that used in SFZ 2008, which matches the deep - ocean data used in the CSF 2005 study, provided at an earlier date than was the SFZ 2008 surface and upper air data.