margin overa wrote:...I didn't know I was "provoked", nor was I attempting to provoke you. I was simply responding to your statement.
Any posting of a reply/quote is a response to a stimulus and therefore it is proper to use the term provoke.
margin overa wrote:...I didn't know I was "provoked", nor was I attempting to provoke you. I was simply responding to your statement.
You also need to make sure your examples are current. I've heard too many creationists attempt to discredit evolution or the age of the earth through the use of "unanswered questions" that were actually answered by science long ago. New evidence can challenge theories but good theories can explain new evidence.margin overa wrote:...but his point was that if you're going to take biologists on, you needed to know specifically how a biological process actually worked.
this is not 'a theory'. This is a fact: DATA. It is measured.The ancient rocks were found in Northern Quebec, along the Hudson's Bay coast, 40 km south of Inukjuak in an area known as the Nuvvuagittuq greenstone belt.
The discovery was made by Jonathan O'Neil, a Ph.D. candidate at McGill's Department of Earth and Planetary Sciences, Richard W. Carlson, a researcher at the Carnegie Institution for Science in Washington, D.C., Don Francis, a McGill professor in the Department of Earth and Planetary Sciences, and Ross K. Stevenson, a professor at the Université du Québec à Montréal (UQAM).
O'Neil and colleagues estimated the age of the rocks using isotopic dating, which analyzes the decay of the radioactive element neodymium-142 contained within them. This technique can only be used to date rocks roughly 4.1 billion years old or older; this is the first time it has ever been used to date terrestrial rocks, because nothing this old has ever been discovered before.
"There have been older dates from Western Australia for isolated resistant mineral grains called zircons," says Carlson, "but these are the oldest whole rocks found so far." The oldest zircon dates are 4.36 billion years. Before this study, the oldest dated rocks were from a body of rock known as the Acasta Gneiss in the Northwest Territories, which are 4.03 billion years old. The Earth is 4.6 billion years old, and remnants of its early crust are extremely rare—most of it has been mashed and recycled into Earth's interior several times over by plate tectonics since the Earth formed. - h**p://www.sciencedaily.com/releases/2008/09/080925144624.htm
The oldest evidence for life may be 3.5-billion-year-old sedimentary structures from Australia that resemble stromatolites. Stromatolites are created today by living mats of microorganisms (mostly cyanobacteria, or blue-green algae). These primitive organisms trap thin layers of sediment with their sticky filaments and grow upward to get light for photosynthesis. Modern-day examples of stromatolites can be found in waters off Australia, the Bahamas, and Belize.
In the Archean structures, layers similar to those seen in living stromatolites are evident, and secondary structures interpreted as simple filamentous microfossils have been recovered from the layers. The biotic origin of the structures has, however, been questioned. Both the supposed Archean stromatolites and the microfossils may have been produced by inorganic processes. Regardless, uncontested microfossils and chemical traces of life were present at least by 2.7 billion years ago. Stromatolites that were produced by microorganisms are abundant later in the Archean and throughout the Proterozoic. These sedimentary structures, formed by organic processes, provide important evidence of early life. At present, we can say with certainty that life had evolved by 2.7 billion years ago, and possibly as early as 3.5 billion years ago. - h**p://paleobiology.si.edu/geotime/main/htmlversion/archean3.html
Yes, because everything changes or has variation. So why should any one assume decay rates are the one thing that has no variation and cannot be influenced?agricola wrote:Do you have any reason to think that the original assumption that rates of decay are constant is NOT true?...