Megan experimented with growing mold. She took 3 pieces of bread from the same loaf and placed
each into a plastic sandwich bag. Before sealing the bag. she added 5 drops of water to each slice.
Next, she placed one bag on her window sill, one in a dark cabinet, and one in a room away from
sunlight. Megan concluded that the different amount of mold that grew on each slice was due to the
amount of light it received. Is this a valid conclusion?
Yes, because the light was the manipulated variable.
O Yes, because the light was the controlled variable.
O No, because the light could not have affected the growth
O No, because the light should have been the same for each bread slice,