Explanation for Question 45 From the Reading Section on the 2019 May Sat
Question 45 says the past is most strongly suggested in designing their experiment to 2 Barry and will help us try to exclude the possibility that what, 3 so let's look back at where they discussed the design of the experiment, 4 and we can get some evidence to answer this question so we can look 5 at these last two sentences. They say the tanks solid walls could strongly affect 6 the flow patterns generated by the shrimp as they swam. 7 So the researchers kept the shrimp away from the edge of the tank by 8 shining the green laser beam directly down into the center to help visualize the 9 swirls and eddies generated by the shrimp. The researchers added copious amounts of silver 10 coated microspheres to the water and eliminated them with a red laser, 11 a color that doesn't seem to affect the shrimp's behavior. 12 So you can see based on these two sentences that these researchers to very 13 unwell hummus are really trying to exclude like anything 14 else that could affect the patterns, 15 the flow patterns of these shrimp, other than the shrimp themselves, 16 right? 17 They don't want the solid walls of the tank to affect their flow 18 patterns. They don't want the red laser to affect their behavior that could affect 19 their flow patterns. So they're really trying to maintain the integrity of their 20 data with like making sure the environment that they're in doesn't 21 change or skew that data. So if we look at the 22 answer choices here, we can see that answer choice a say...