But there are many differences between a real person and a fetus. First of all, the fetus is entirely dependent on its mother. Fetuses need their mothers to be nourished properly, to live in a stable environment, to grow and develop, among other things. Because the fetus cannot survive on its own, therefore it cannot be considered a human being. Furthermore, a fetus still in the womb is just a potential person. The fetus resides inside the mother and is therefore a part of the mother herself until it is born. Another difference between a fetus and a person is that a person can feel pain. Anti-abortionists generally argue that abortion is wrong because it would cause pain to the fetus. But, according to Mark Rosen, an obstetric anesthesiologist at the University of California, San Francisco, "the wiring at the point where you feel pain, like the skin, doesn't reach the emotional part where you feel pain, in the brain." . .” In addition, the thalamus is not formed until the 28th week of pregnancy. Thus, no information, including pain, can reach the cerebral cortex for processing. These facts prove that the fetus would not be affected by the mother's choice to abort, thus proving Marquis and all other anti-abortionists wrong. In conclusion, Marquis' argument that abortion is wrong is incorrect. Thomson gives many examples of why Marquis is wrong, including the mother's right to her body