Stickleback fish protect themselves from predators with a thick covering of brownish plates. They feed on small aquatic organisms and are preyed upon by bigger fish like trout. In a certain lake, the number of stickleback fish was documented over a period of 30 years. During this time, the clarity of the lake water also changed. 1. How did the occurrences of the different traits change over the 30-year period? Use evidence from the graph to support your answer. Using what you know about natural selection and adaptation, what generalization can you make based on these changes? (15 points)