A scientific explanation
Quote to Prove
"The odds of two people with separate sperm and separate eggs creating organisms that look exactly the same or people that look the same is almost impossible. It's 1 in 70 trillion times that would happen."
Through meiosis, gametes are formed. Different pairs of gametes are formed as shown in the images below. During meiosis different processes allow for tons of different variations. These processes are called crossing over, independent assortment, and random fertilization.
Crossing over is when genetic material from the two tetrads switch places. One tetrad has a certain amount of the other on it. The other tetrad gets an equal amount of the first tetrad. The amount that crosses over is not set, so different amounts can come from different tetrad sets. This creates more variation helps prove the statistic by showing that tons of possibilities are already created with only one of the ways that the variations are created.