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Biology, 31.01.2020 12:48 geckos7992

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?
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