Posted by:
helamonster
(
)
Date: January 19, 2012 04:26PM
"The evidence for evolution is overwhelming. It's in the fossil record, carefully dated using radioactivity, the release of particles from radioactive isotopic decay, which works like a very precise clock. Rocks from volcanic eruptions (igneous rocks) buried near a fossil carry certain amounts of radioactive material, unstable atomic nuclei that emit different kinds of radiation, like tiny bullets. The most common is Uranium-235, which decays into Lead-207. Analyzing the ratio of Uranium-235 to Lead-207 in a sample, and knowing how frequently Uranium-235 emits particles (its half-life is 704 million years, the amount half a sample decays into Lead), scientists can get a very accurate measure of the age of a fossil.
But evidence for evolution is also much more palpable, for example in the risks of overprescribing antibiotics: the more we (and farm animals) take antibiotics, the higher the chance that a microbe will mutate into one resistant to the drug. This is in-your-face evolution, species mutating at the genetic level and adapting to a new environment (in this case, an environment contaminated with antibiotics). The proof of this can be easily achieved in the laboratory (see link above), by comparing original strands of bacteria with those subjected to different doses of antibiotics. It's simple and conclusive, since the changes in the genetic code of the resistant mutant can be identified and studied."
http://www.npr.org/blogs/13.7/2012/01/18/145338804/why-do-so-many-have-trouble-with-evolution?sc=fb&cc=fpEdited 1 time(s). Last edit at 01/19/2012 04:30PM by helamonster.