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 _____
Any other differences between groups, such as amount of sleep, G.P.A., or even unknown factors, are more likely to be equally distributed if subjects are chosen randomly. Random assignment is the only way to assume the difference in test scores is caused by listening to music while studying. It allows psychologists, and budding psychologists like yourself, to have confidence that the results of your study are valid.