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Hoover presented several dramatic images and the associated EDAX spectral data of living and fossil cyanobacteria haloalkaliphilic mats, the Cambrian phosphorites of Khubsughul, Mongolia for comparison with the recent discoveries in the Orgueil and Murchison carbonaceous meteorites. Evidence for possible microfossils in meteorites was previously reported in numerous papers by many scientists (Nagy, Claus, Timofeyev, Van Landingham, Palik, McKay, Rozanov, Hoover, etc.) These results have previously been attacked by critics, who have argued to dismiss them on the basis that they were too small to represent living organisms or that they must be mineral grains, artifacts produced by coating the sample, or recent pollen or fungal contaminants that were introduced during acid maceration, cleaning, or while the specimen was lying in some museum drawer.
Originally posted by NavalFC
Why are you assuming that any alien life thats out there uses DNA?
You are aware that DNA is what life is built of here on *EARTH*. In the early Earth early life- well w might not have even called it life- were self replicating nucleotides that chained together to become ploynucleotides and likely the first was based on RNA, with DNA evolving as the better chaining method. The remnants of RNA replication can be seen today in the form of retroviruses and other pieces of RNA.
Now by saying "alien DNA" you are making a large assumption there. you are assuming that any alien world evolved in the exact manner of Earth.
Evolution happens in response to envirnmental factors that act as selective pressures for natural selection to occur. To put it differently, if you have a totally different environment evolution will happen a toally different way.