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Students survey fish populations in two ponds that are ten miles apart. Their data are displayed in the graph below.

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Which of the following is a possible explanation for the different percentages of eye numbers?


Fish are migrating from Pond 1 to Pond 2.


Pond 1 has a more diverse ecosystem with more available niches than Pond 2.


Pond 2 has been exposed to more mutagenic chemicals than Pond 1.


Pond 2 has an ecosystem in which natural selection favors more eyes.

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