The answer to this question is DNA. DNA stands for Deoxyribonucleic acid. When you are forming in your mother's body, the DNA from your parents comes together to make a person...or you. When genes are aligned in certain ways, they copy the traits of another human. This is why you may have feet that look like your dad's, and hands that look like your mom's. It is because some of there genes aligned like yours.
Hope this helps! :)
