This timeline of evolution of life represents the current scientific theory outlining
the major events during the development of life on planet Earth. .... Bacteria
develop primitive forms of photos...
The First Life on Earth Earth was able to support life only after the planet had
cooled enough for a rocky crust to solidify. Once that happened, water vapor from
Oct 19, 2015 ... These crystals provide a rare glimpse into the first chapter of Earth's history,
known as the Hadean eon. “They are pretty much our only physical ...
But despite knowing approximately when life first appeared on Earth, scientists
are ... Today, there are several competing theories for how life arose on 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.
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?
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).
Jul 14, 2009 ... There are all sorts of ways to reconstruct the history of life on Earth. ... First
undisputed fossil evidence of cyanobacteria, and of photosynthesis: ...
So it appears life was underway at least within 700 million years of the formation
of the Earth (4.5 billions years ago). To-date these are actually the oldest ...
For as long as we have known about them, scientists have thought that simple
bacteria were the link to the earliest life forms on earth. However, growing ...