Are there choices? If there are choices what are they?
Well if you mean what does the controlled part of a scientific investigation, it is the part of the investigation that will be your control or your base, untouched, original, data and such.
June solstice is the time when the Northern Hemisphere is
tipped most specifically toward the Sun and gets the most direct daylight. It
happens around June 21 (also called summer solstice) on the day where the Sun
takes after its longest and most elevated way through the Northern Hemisphere
sky and its shortest way through the Southern Hemisphere sky.
Answer:
It should be the Prime Meridian.
Explanation:
You do not have a picture but the equator is a line of latitude that travels east to west. The International Date line is an imaginary line through the Pacific Ocean that begins a new day (it has to do with time zones). The Arctic Circle is only in the north and it is a circle, not a line. Lastly, the prime Meridian is a line of longitude that travels from north to south and cuts the world in half between eastern and western hemispheres, like the Equator cuts the globe into the northern and southern hemispheres. The Prime Meridian goes through the Atlantic Ocean and cuts off put of Africa.
I hope this helps!