38-06-O. An Inconvenient Truth: Molecular Evidence for
an Early Emergence of Animals Long Before the
Cambrian Explosion in the Fossil Record
Blair Hedges (sbh1@psu.edu)
Pennsylvania State University, Department of Biology, USA
Yet, ironically,we still have a relatively POOR UNDERSTANDING of the early history
of life on our own planet. Even more pertinent to searches for complex
life in the cosmos is the fact that WE DON'T KNOW when our own complex
life—for example, animals—emerged and diversified. Was it
closer to 500 million years ago OR a billion years ago? [ quite a large gap, don't you think?] ..... But despite years of study using molecular clocks, there is still NO WIDELY ACCEPTED RESOLUTION OF THIS QUESTION. .... THIS RESULT IS INCONVENIENT BECAUSE IT REQUIRES AN EXPLANATION FOR SUCH LONG GAPS IN THE FOSSIL RECORD. Explanations have been proposed for the gaps but there has been resistance
to embrace them in large part because of the perceived LACK OF AGREEMENT among molecular estimates. Now, these explanations require renewed consideration.
- From the recent Astrobiology conference.
25-02-O. How Many Hard Steps in Our Evolution?
Brandon Carter (brandon.carter@obspm.fr)
Laboratoire de l’Univers et de ses Theories, Observatoire de Paris-
Meudon, France
"This means that some of the essential steps in the evolution process leading to the ultimate emergence of intelligent life would have been hard, in the sense of being
against the odds in the available time, ...... It was originally estimated
that only one or two of the essential evolutionary steps had to have
been hard in this sense, but it has become apparent that this figure may
need upward revision...... It will be shown that the fossil record provides tentative evidence in favor of a six step scenario"
Can't explain 2 steps, yet expect evolution to have all the answers when as much as 6 critical unexplained steps now postulated.?
SPACE.com -- Primitive Alien Life May Exist, Stephen Hawking Says
"intelligent life as we know it is exceedingly rare." - Stephen Hawkins
What an understatement.
It looks like the science hardly supports evolution - coming from evolution scientists themselves.