Molecules can become fossils just as bones can, Peggy Ostrom, a biochemist at Michigan State University. Biochemicals within bones can be extracted and then crystallized. This is called mass spectrometry, and has been used to determine many things, like that horses are exactly the same as they were 42,000 years ago. This process does seem useful, but i believe it is also one-sided and can only tell whether genes of animals now are the same as genes of animals long ago or not.
Pages 100-120
(This entry was to be written on Sunday, but was not)
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