Yes it is answer A. (At least 20 characters long)
Answer:
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the major effects of the earth’s revolution is not that there are seasons (contrary to what some reserve teachers think), which are caused by the axis tilt. however given that the axis tilt is responsible for seasons, the orbit around the sun will make them repeat themselves once per amount of time the earth takes to orbit. the earth’s REVOLUTION will also mean that we see different groups of stars at night over the course of a year. the earth’s revolution around the sun also enables us to measure the distances to nearby stars using the mathematical concept of PARALLAX. The earth’s motion needs to be separated out from our observations about motions of other objects, for example, retrograde motion of planets like Mars, Jupiter and further planets are the result of the earth traveling faster than they do as we overtake them.
All of them were river valley based civilization remains, thought we have many cities we have many cities in uneven terrains and arid regions , which may either have been outposts for trade, or were well used with water harvesting techniques to use the little available water through the rains . Created artifacts indentify as “art”, religion and priestly class that maintained rituals and douctrines
D. GPD per capita i believe
