Day and night are caused by a the tilt of Earth's axis.
b. Earth's revolution around the sun.
c. eclipses.
d. Earth's rotation on its axis.
PLS HURRY this is suppose to be science by the way

Acivilization exists for several hundred yeaars, developing its own language. such a civilization probably has been: a. farming corn b. suffering from a lack of contact with the outside world. c. isolated by mountains or some other physical barriers. d. starving from lack of trade.