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Making a human always takes the same three ingredients—an egg cell, a sperm cell, and a uterus. But just how the ingredients come together is a fascinating tale. With discoveries in science and medicine, we have insemination and IVF, along with sex, to bring babies into the world. Sometimes the ingredients that created us come from the same people who are raising us. Other times, we don’t share genetics with the people responsible for our care, such as when we are raised by stepparents, adoptive parents, or foster parents. This is also often true when donors and surrogates are involved
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