Janet is testing the effectiveness of four different plant foods. she plants four identical seeds in four identical pots, supplying each with a different type of plant food. after six weeks she finds that the four plants have grown to different heights.
can janet conclude that food w is the most effective of the four plant foods?
a. yes; since the plant that was fed food w grew to the greatest height, the only explanation is that food w is the most effective.
b. no; janet needs to test many more different types of plant food before she can reach that conclusion.
c. yes; 18 inches is the tallest a plant of that species has ever grown.
d. no; janet needs to conduct repeated trials on many different plants before she can make that conclusion.

D, because you need multiple trials to prove something

there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?

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