Before the Cultivation of the Apple Tree, Apple Maggot Fly

Before the cultivation of the apple tree, apple maggot fly laid their eggs exclusively on the fruit of Hawthorne trees. As apple orchards became more prominent, apple maggot flies began to lay their eggs on both the fruit of the Hawthorne tree and the fruit of cultivated apple trees. Now, apple maggot flies that live on apple trees mate and lay their eggs at different times of the year than apple maggot flies that live on Hawthorne trees. Is this an example of reproductive isolation? Explain your answer.

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This is an example of reproductive isola...

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