Jeanne Mancini, president of the March for Life.

(CNSNews.com) -- The theme for the 46th annual March for Life is “Unique from Day One: Pro-Life is Pro-Science,” March for Life President Jeanne Mancini announced at a press briefing on Capitol Hill on Tuesday.

“I very happily and proudly announce to you that the 2019 March for Life theme is ‘Unique from Day One: Pro-Life is Pro-Science,’” she said.

“Our DNA is present at the moment of fertilization and no fingerprint ever – past, present, future – is like yours,” she added. “And that’s what it means to be unique from day one.”

The March for Life is the largest annual human rights demonstration in the world, according to its 2017-2018 annual report. Its mission, as defined by Mancini, is to “to protect and defend life from the moment of fertilization.”

The 2019 march will feature such speakers as Ben Shapiro, host of “The Ben Shapiro Show” and Editor-in-Chief of The Daily Wire, and Abby Johnson, founder of And Then There Were None, a pro-life organization that helps abortion workers escape the abortion industry. The march will take place on January 18, 2019 in Washington, D.C.

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Mancini introduced three pro-life speakers at the press conference, including Dr. David Prentice, vice president and research director of the Charlotte Lozier Institute; Dr. Grazie Christie, policy advisor for the Catholic Association; and David Daleiden, investigative journalist for the Center for Medical Progress.

Prentice, an expert in stem cell research and bioethics, gave a presentation detailing the stages of human development from the moment of conception, noting that life begins at conception. The major biology and microbiology textbooks teach this scientific fact.

“Your world was shaped in the first 24 hours after conception,” Prentice said. “These are the scientific facts, and this is a consensus, really, in the scientific world. The arguments aren’t really about biology. This is accepted science and has been for decades.”

However, abortion advocates have tried to shift the terminology surrounding fetal development for political reasons.

“There have been people, though, who have tried to re-define the biology. They’re not changing the biology, they’re just trying to change the definition of what we would recognize,” Prentice said, adding that people tried to change the definition of an “embryo.”

Baby in the womb. (YouTube)

“But it was politically motivated,” he said. “It had no basis in biology.”

Prentice also pointed out that embryonic stem cells are not needed to cure illnesses. Instead, scientists have used adult stem cells, which he called “the gold standard for patients.”

“You don’t have to destroy that young human life – that embryo – to actually heal,” he said.

The second speaker was Dr. Christie of the Catholic Association, a radiologist who argued that science can help people understand life in the womb.

According to Christie, “medical science has always been at the service of life – saving life, prolonging life, enhancing life.”

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She discussed the development of ultrasound, which she called “the game changer” because it allows people to hear the fetal heartbeat and see babies in the womb. She argued that a person must be blind or deaf not to see “the truth.”

“For us to believe what the pro-abortion movement tells us about early human life and the flourishing of women and the decency of our culture requires blindness, deafness and silencing of the truth,” Christie said. “But modern science has changed everything. It has opened our eyes, it’s opened our ears and it’s allowed us to speak the truth with perfect confidence.”

Daleiden, the final speaker at the event and the investigative journalist behind the 2015 undercover video exposé of Planned Parenthood’s trafficking of baby parts, spoke about the “objectification of abortion.”

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Daleiden argued that the trafficking of fetal tissue is “horrifying because it shows a level of objectification beyond the original objectification of abortion.”

“Our unborn brothers and sisters are objectified first by an abortion doctor when they’re killed, as something less than human or less than equally valuable to us. They’re objectified again by parting them out like widgets on an assembly line,” he said.

Daleiden also highlighted the Wednesday story by CNSNews.com which exposed a $13,799,501 federal contract between the National Institutes of Health and the University of California at San Francisco to “obtain body parts from unborn babies to make at least two types of ‘humanized mice,’” according to the article.

He called the contract “absolutely unconscionable,” especially since it exists “under a pro-life administration” which, he argued, “could end this tomorrow” if it chose.