Biology, 26.09.2019 15:00, destanybrunson

Which of these would not be a valid scientific theory?
a all cells come from pre-existing cells.
b humans originated on earth from outer space.
c the universe is expanding at a constant rate.
d at one time, all of earth's continents were one large land mass.

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Which of these would not be a valid scientific theory?
a all cells come from pre-existing ce...