The distance north or south from the equator a - prime meridian b - true north c - latitude d - longitude e - map f - reference point e - cardinal directions

The correct answer is C. The distance north or south from the Equator is latitude.

Explanation:

Latitude is a geographic coordinate represented by an angular value, the expression of the position of a point on Earth (or on another planet), north or south of the equator, which is the reference plane. When they are connected to each other, all the places of the Earth with the same latitude form a circle whose plane is parallel to that of the equator, hence the term "parallel" to name a latitude.

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

"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."