A 19th century scientist investigates cell growth by placing boiled broth in one Erlenmeyer flask and non-boiled broth in another flask. The scientist covered both flasks so that air could not enter the flasks and observed them for two weeks. Neither flask grew any biological matter. From this, the scientist concluded that abiogenesis or spontaneous generation was an invalid theory. A) The conclusion is invalid because the scientist did not wait long enough for anaerobic cells to grow in the broth.
B) The conclusion is invalid because living objects often require air to grow regardless if their origin was spontaneous or not.
C) Since no colonies of cells grew in either flask, the conclusion is valid because spontaneous generation predicts that cells should grow spontaneously.
D) Since no colonies of cells grew in either flask, the conclusion is valid because cells can only grow from other cells