As Ayn Rand argues, "Life is a process of self-sustaining and self-generated action." Such a process begins when an egg and sperm cell unite. Thus, a new living being comes into existence at conception. All human beings have the right to life, so even a newly fertilized zygote (being a living human being) has the right to life. And "the right to life," explains Rand, "means the right to engage in self-sustaining and self-generated action." For a zygote, embryo, or fetus, this means the right to continue receiving sustenance and shelter from its mother. Therefore, abortion is murder.