Longitude is used to measure distances in degrees from the Prime Meridian. The correct option among all the options that are given in the question is the second option. The main purpose of longitude is to determine the east and west position of a point based on its geographical coordinate. I hope the answer helps you.<em />
The complementary strand it what matches to the original. T means the complementary letter will be A (and vise versa), C means the complementary letter will be G (and vise versa). Hope this helps
