When did scientists in general claim they knew when life begins? First I've heard of it. Which came first, the chicken or the egg? If you think you know the answer to the question, "when does life begin?", you are practicing idealogical dogma, not science. Objectively, an honest scientist would tell the truth and say he or she doesn't know or isn't sure. Science, as yet, cannot give a satisfactory answer to this question.
If your are against abortion, but do not believe in using contraception (including full insurance coverage), don't believe in teaching comprehensive science-based sexual education in school (no more abstinence-only), and don't believe in allowing same-sex couples or single parents to adopt - you are not pro-life, you only want to control women's bodies.
Science is only what we know now. It changes all the time. Life starts at conception. We now know for a fact when the sperm meets the egg. There is a flash of light. That is extraordinary.
Science also proves masks don't work to stop the spread of anything. A mask cannot stop particles that are microscopic on nature.
People hang onto whatever fits the narrative of their belief. If they choose to murder a baby. They justify it by saying it's just a clump of cells and has no value.
Yet these are the same people who will claim to do everything for the children.
You also can't trust any science that is getting there funding from people that want a certain result. Scientists are people to. Some immoral and willing to say anything to keep funding, and those that actually search for the truth. Unfortunately those who seek the truth are silenced and ostracized.
Always follow who is financing the study. Like planned parenthood is not going to hire a scientist who says life begins at conception. Obviously the CDC which is a private corporation is for the machine. They don't anything that contradicts what the politicians and elite want published.
Sad fact of today, science is the new religion, and common sense and real science is thrown out the window for propaganda and control.