The answer is A. Sympatric
The 3 main regions of the brain are the cerebrum, cerebellum, brainstem.
Sample b is the control group because it’s the group not being tested and being kept the same.
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.