This timeline of evolution of life represents the current scientific theory outlining
the major events during the development of life on planet Earth. ... The first known
mass extinction in earth'...
The history of life on Earth began about 3.8 billion years ago, initially with single-
celled prokaryotic cells, such ... 570 million years ago, First arthropods evolve.
Oct 19, 2015 ... Now, a controversial new study presents potential evidence that life ... These
crystals provide a rare glimpse into the first chapter of Earth's ...
Sep 1, 2016 ... Indeed, some scientists think life appeared the moment our planet's ... But despite
knowing approximately when life first appeared on Earth, ...
Mar 24, 2016 ... From lightning to space rocks, here are ideas for how the first life on Earth came
The study of the origin of life on Earth or, more specifically, how life on Earth ... is
the study of how living things have changed over time since life first arose).
Sep 10, 2011 ... For nearly the first billion years of formation (4.5 to 3.8 billion years ago) ..... Life
as we 'know it' formed – first Earth out of the same gases and ...
Scientists do not know how life began on Earth. ... carbon dioxide in the presence
of a catalyst into small organic molecules - was how the first life developed.
Jul 14, 2009 ... There are all sorts of ways to reconstruct the history of life on Earth. ... The first life
may have developed in undersea alkaline vents, and was ...
This suggests that life must have evolved sometime during Earth's tumultuous
first billion years. How did life evolve? And what did early forms of life look like?