The blood of a normal healthy adult rat contains 5 million red blood cells (rbcs) per microliter of blood. each deciliter of blood contains 15 grams of hemoglobin. each rbc contains 250 million molecules of hemoglobin (a fairly close approximation for a healthy adult retired breeder female rat). suppose you have 9.96 ml of blood drawn from a healthy female retired breeder rat, then how many rbcs are in this blood sample?

"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."

not only is it colder, it also becomes darker, less salty, and more dense.