We found evidence of life from Mars, from Mars rocks with single cell organism.
But, somehow a Human fetus is not life.
Leftists are bonkers typically.
The legitimacy of the supposed Martian microbes has challenged or debunked by most scientists with expertise in the field.
At any rate, Martian microbes are not human beings imbrued with human consciousness.
Nobody actually believes a human being's life begins at conception. We know this because exactly zero people on the planet would run into a burning fertility clinic to save the petri dishes of blastocysts.
Therefore the question of when a human being's life begins is subjective and metaphysical, and neither the Pope nor particle physicists can lay claim to the categorical truth about it.