What information do fossils provide about the history of organisms on earth? a. organisms have stayed exactly the same since the earth was formed. b. fossils do not provide any information about the history of organisms on earth. c. organisms on earth have evolved and changed significantly over time. d. organisms on earth have not evolved or changed during the last 200 years.

卂几丂山乇尺

Option "C" that is; Organisms on Earth have evolved and changed significantly over time,

is correct ✓

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."