|Like particle cosmology,
has a big bang with associated parts like quarks
Life on the earth
may have originated from a soup of natural organic molecules including
acids. In one picture something happened and RNA formed. DNA evolved out of the RNA world .
Complex life arose out of DNA. This process is the Big Bang
The linked action of DNA and RNA propagates the genetic code very well
and also generates the proteins needed for life. It is as though one
had a computer
code capable of producing central processors as needed.
A word of caution is in order here.
not your granddaddy’s biology. The tree of
life at the start of
our hundred years is only a small part of what is now recognized.
New arrivals include the archaea
with the halophiles, biota that flourish in salty environments, and
? The origin
of life is not understood.
place to read about this is de Duve’s 2002 book "Life
Evolving". De Duve argues that getting RNA by chance is
implausible. A complex
chemical environment is needed. Catalysts may or may not be required.
might help. Perhaps there is a natural selection for molecules. One
clue may be chirality,
handedness in molecules. The history of
billion years on earth also should offer hints. For the first 0.1
Gyr there was
atmosphere of water, carbon dioxide, carbon monoxide, nitrogen and
the rain came and a rocky crust appeared in the 0.2 to 0.4 Gyr period.
Biologically processed carbon appeared at 1 Gyr generated from
self-replicating, carbon-based microbial life. This was anaerobic life
much free oxygen around. Then photosynthesis began to produce oxygen.
is that life started relatively early!