A fertilized egg is called a zygote until it divides into 16 cells, forming a ball-shaped structure called a morula. The events during the zygote stage involve the integration of both parents' DNA into the cell nucleus and the beginning of rapid cell division, or cleavage.
It is a perfect example of a natural selection.
(I'm not sure if this is the exact answer that you are looking for.)
Solutions due to it being a mixture
First four are made of rock and rest are made of gases.
Atmospheres of all the planets are made of gases.
