Plants grow naturally towards the strongest source of light, this is called phototropism. They do this in order to maximise their exposure to the sun and increase the amount of photosysnthesis (and therefore growth). This is a survival mechansim.
researcher will either use random assignment or matching What do random assignment and matching have in common? They are both designed to create equivalent groups of participants. Random assignment is to random selection as _____ is to _____
That is, the experimenter randomly assigned students to the two groups. Random assignment is a powerful tool though it does nothing to decrease the amount of error that occurs as a result of extraneous variables, in only equalizes it between groups.