Biology, 20.09.2020 15:01, keananashville

Twenty fruit flies are placed in each of four glass tubes. The tubes are sealed. Tubes I and II are partially covered with black paper; Tubes III and IV are not covered. The tubes are placed as shown. Then they are exposed to blue light for five minutes. The number of flies in the uncovered part of each tube is shown in the drawing. These data show that these flies respond to (respond means move to or away from):

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Twenty fruit flies are placed in each of four glass tubes. The tubes are sealed. Tubes I and II are...