Day and night are caused by the earth’s a. biosphere b. rotation c. revolution d. atmosphere

Rotation is the answer

The correct answer to your question is pretty simple! It is caused by Earth's B Rotation! You might get confused with C as well, but a revolution is when it rotates around the sun, when it does a complete loop around the Sun. A rotation is when it rotates around it's axis, and that is what causes day and night.
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May consider a group  g=({0,1},+)g=({0,1},+)where  ++  will work as the xor operator like we work in boolean algebra. note here, that ‘00’ and ‘11’ are not the usual 0 and 1 that we work with everyday. the elements are  called  ‘00’ and ‘11’ and  may not mean  zero (nothing) and one (single). ‘00’ is the identity for the given binary operator +, meaning that any element operated with ‘00’ gets us that element itself.  for a set  ss  in  g′g′  having more elements than just  {0,1}{0,1}  the values for  a+b∈sa+b∈s, such that  a∈s,b∈sa∈s,b∈s, have to be first defined, only then can you determine the value of  1+11+1. the answer could possibly have been  22  if oanswer is25,000

Ca mega city if i’m not mistaken