Aresearcher designs an experiment by manipulating room temperature (cold, warm, or hot); noise level (quiet or loud); and room color (pink, blue, or black). identify the possible number of main effects.

The possible number of main effect is THREE.
Main effects refers to the major conditions that are specify in the experiment; these are: room temperature, noise level and room colour. These three factors are manipulated in the designed experiment. 

Cell division is important to single celled organisms because it allows the cells to reproduce. through cell division, cells make exact copies of themselves. when single celled organisms go through cell division, they make exact copies of themselves which is how they reproduce.