Occupations that draw on a knowledge, understanding and application of scientific principles

The correct answer to this open question is the following.

The occupations that draw on knowledge, understanding, and application of scientific principles are the following.

We are talking about occupations that use science such as physicists, aeronautical engineering, astronomy, biology, chemistry, oceanographer, mathematician, Medicine, forensic scientist, or computer engineering. These occupations use the scientific method.

the dark variety, as they are not visible on the dark tree barks

explanation:

"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."