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What would it be like to have a double? This is a question people often ponder. We often state that they see someone that resembles someone they understand. It is almost like dejavu. "Twin" comes from the word "twine" meaning "two together" (Nagy 1). Most people automatically think of just two people who look alike when they hear the term "twin". But, there's a lot more to twins than simply looking alike. Twins are the most frequent kind of multiple births. Many think there are just two kinds of twins, identical and fraternal; they frequently exit conjoined twins. Twins are extremely unique and fascinating individuals due to their similarities biologically, emotionally, and psychologically. A writer from the twin's network said that, "A British scientist was the first to state the twins are indistinguishable biologically and may have come from a single egg" (Nagy 1). He was right when he made this hypothesis. Identical twins form when a single fertilized egg splits usually one to two days following conception (Wade 53). Identical twins are the same gender, they have the same chromosomes, and are the same blood type. Identical twins also mean monozygotic twins. According to the double's system, studies indicate that identical twins live more compared to fraternal twins; they believe this is a result of their close communication (Nagy 1). Fraternal twins are the most common kind of twins. They are the end result of the marriage of two eggs and two sperm. Fraternal twins may be the exact same or different genders (Wade 53). Segal states that, "They are two people, no more genetically alike than brothers and sisters which develop from separate fertilizations" (Segal 1). Surprisingly, fraternal twins can be conceived at separate occasions and have different dads. It seems to be a hereditable trait to gratify fraternal twins. However, inclination to conceive conjoined twins might result from genetic and ecological conditions (Hunter 1). Conjoined twins are the rarest kind of twins. Conjoined twins were once called "Siamese twins" Conjoined twins originate from a single fertilized egg so they are always equal and same sex twins. The growing embryo begins to divide into identical twins within the first two weeks following conception but stops prior to completion. A partly separated egg consists of the embryo, and it continues to mature into a conjoined fetus (Hunter 1...