Because at night, we need sleep. And in the day time
the sun gives out vitamin D, necessary for healthy bones.
Because the earth turns and the sun can only shine on one side at a time so at night were on the dark side
because earth is rotating and revolving
Days are longer than nights in the summer, and the reverse in the winter.
About 121 Earth days
Earth
Days and nights, sunrises and sunsets.
Days and nights occur because of the diurnal rotation of the earth. The sun stays still, and the earth spins once a day, so for 12 hours half the earth is in sunlight.
about 121 earth days
The earth rotates on its axis
There are some tiny variations because of the tilt of the earth, but we can say that days and nights are roughly equal at the equator.
They are around the same length as days on Earth.
No. (But if you like that idea, go read Terry Pratchett.)
Because the earth was full of wicked things