This is very possible becuase the earth orbits, and when it orbits, the sun moves to the other side of the planet, while we have night. when we see the moon at night, we can only see it when the suns reflection hits the moon to make it glow.
The embryonic stage is the second stage of development and lasts from two weeks until the end of the second month. During this stage, most of the vital organs and various bodily systems begin to develop. The third stage of development is the fetal stage, and it lasts from two months through birth.
