He discovered several species of finches that varied from island to island and it helped him make his theory of natural selection.
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Answer:
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Explanation:
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A. Without doing much math, it can be seen from the graph that the altitude is decreasing. The slope of the position time graph determines velocity, so by comparing the start to the end of the graph, it can be seen that -100m was the change in altitude and 25 seconds was the change in time. Divide -100 by 25 to get -4m/s.
