You will be able to change minds when you inform them that neither of these assumptions is true. Wade did not create a limited right to abortion but a virtually unlimited right to abortion throughout pregnancy.
Here's how: The case involved an 1854 Texas law prohibiting abortion except "for the purpose of saving the life of the mother." The plaintiff, whose real name is Norma Mc Corvey, desired a purely elective abortion and filed suit claiming the Texas law deprived her of constitutional rights. While admitting that abortion is not in the text of the Constitution, they nevertheless ruled that a right to abortion was part of an implied "right to privacy" that the Court had fashioned in previous rulings regarding contraception regulations.
Arguing from Science The "classic" arguments from the other side are collapsing under the weight of science.
"No one knows when life begins" and "It's a blob of tissue" are frankly on the wane, especially in the context of surgical abortion, which is how the vast majority of abortions are done today. Still, establishing the evidence of the beginnings of human life will ground your argumentation in science, giving you a firm foundation for additional arguments and preempting the charge that you are basing your position on faith or religious belief.
("Privacy" is not in the text of the Constitution either.) They also ruled that the word "person" in the Constitution did not include a fetus. For a debate on abortion policy, the most important part of the ruling to understand is the new "law" it established, and here is a description of it that you should commit to memory: The Court ruled that abortion must be permitted for any reason a woman chooses until the child becomes viable; after viability, an abortion must still be permitted if an abortion doctor deems the abortion necessary to protect a woman's "health," defined by the Court in another ruling issued the same day as "all factors--physical, emotional, psychological, familial, and the woman's age--relevant to the well-being of the patient." In this way the Court created a right to abort a child at any time, even past the point of viability, for "emotional" reasons.
Stated another way, the Supreme Court gave abortion doctors the power to override any abortion restriction merely by claiming that there are "emotional" reasons for the abortion.
The best you can do is arm yourself with the facts and deliver them in what you hope will be a winning way for your audience -- meaning you will need to make your case, in most instances, not in the language of faith or religion but in the language of the post-modern secularist.
What follows, therefore, are the best arguments from science, the law, and women's rights to advance the pro-life case against abortion.
"Zygote" is the name of the first cell formed at conception, the earliest developmental stage of the human embryo, followed by the "Morula" and "Blastocyst" stages. Is it human? Is it just a cell or is it an actual organism, a "being? You should raise them, and then provide the answers.
The zygote is composed of human DNA and other human molecules, so its nature is undeniably human and not some other species.