Select the word from the list that best fits the definition “a representation of the earths surface”

Map

Explanation:

Map is the representation of three dimensional curved surface of earth on a two dimensional flat surface such as paper, screen etc. For projecting earth on a map, imaginary lines i.e latitude and longitude are drawn on the earth’s surface which is represented as gridlines on the map. The projection of earth’s surface on a map always bear some or the other kind of distortions and hence is never accurate  

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.