Natural Science Forum / Biology / Evolution / June 2005

... be retained by the gravity well of Mars, the escape velocity? Are
there any anaerobic bacteria that would be able to transform the
assumed martian soil into such gases? I remember that an
Oxygen-Nitrogen mix would not be retained, but I may be wrong. Can we

In the previous posting, we discussed three "modes" by which evolution
can create a complex structure which implements a complex function.
These were:
- Exaptation: An old structure takes on a new function.

I think my simple model says all this that is below
in a more clear and distinct way:
Model of Selection Pressure
The greater the selection pressure

Tim Tyler wrote:

Question: How much distance would a group of 16 to 24 hunter-gatherers
cover in a day?

Ernst Mayr: "Evolution and the Diversity Of Life" pages 309- 310,
Harvard University Press 1976
"The emphasis in early population genetics was on the frequency of genes
and on the control of this frequency by mutation, selection, and random

Paul Crowley wrote:

"Perplexed in Peoria" jimmenegay@sbcglobal.net wrote:-

Quote from the RNA and UV full text article
(best version of all) at
http://www.biomedcentral.com/1471-2148/3/12
" Indeed, no other known energy source

I apologize in advance if this is not the correct group for my question
This is NOT scientific research but, from my observations, I have
noticed that roughly 10% of females will, in moments of contemplation,
hold their arms such that the upper arm is vertical, the forearm is

EVOLUTIONARY BIOLOGY: SELECTION AND THE ORIGIN OF SPECIES
The following points are made by A.Y. Albert and D. Schluter (Current
Biology 2005 15:R283):
1) Why are there so many species on earth? Answering this question requires

Would anyone happen to have speculations as to why eukaryotes evolved?
In short, what can single-celled eukaryotes (with all of that
complicated machinery) do that prokaryotes can't? Engulfing other
microbes is one such often-mentioned thing. Any other possibilities?

The current issue of NATURE (02JUN05, V435, p565) has an interesting
review of _Evolution in Four Dimensions: Genetic, Epigenetic,
Behavioral, and Symbolic Variation in the History of Life_ by Eva
Jablonka and Marion J. Lamb.

Animals forage with near-perfect efficiency
13:26 24 May 2005
Jeff Hecht
Animals have evolved a foraging behaviour that comes close what physicists

     RNA to the Rescue
     Novel inheritance patterns violate Mendel's laws
     By JR Minkel
The central dogma of modern biology holds that genetic information is