The answer is scrotal elevation. Hope this helps please help me by saying this is the brainiest.
The answer is B. Because, The correct match is like this : Adenine-Thymine and Guanine-Cytosine. A-T and G-C
Only some of the equator gets to experience day and night. When Uranus revolves around the Sun, one part gets light and day while the other gets night and darkness. So it changes because one time you can be looking and its day. Then you will look again and it will be night since Uranus moved around the Sun.