The biological way you are built. you get certain genes and dominant/recessive traits from your parents. hope this helps.
The oldest layers are on the bottom, and the youngest layers are on the top.
During the lunar month, the Moon goes through all its phases. You can see the phases drawn in the image below. Just like the Earth, half of the Moon is lit by the Sun while the other half is in darkness. The phases we see result from the angle the Moon makes with the Sun as viewed from Earth.
hope this helps :)
What’s produced by one is needed for the other
