Astar is moving towards earth. an astronomer plans to measure the distance of the star from earth by observing the red shift in its spectrum. which of these statements best explains why the astronomer's method of measuring the star distance is inappropriate?
the spectral shift of moving stars cannot be observed.
a red shift can be observed when the star moves away from earth.
common instruments cannot measure the red shift accurately.
rate of motion of stars cannot be matched with the rate of measuring distances.

"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."

i think that it is c, d, and e, hope this