In the eastern United States, 28 species of migratory birds are nesting earlier in the spring than they did several decades ago, and northeastern birds that winter in the southern United States are returning north 13 days earlier than they did a century ago.These changes are most likely due to

Question

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The earlier nesting and migration patterns of migratory birds in the eastern United States are most likely due to rising temperatures caused by climate change. As temperatures warm, the birds' biological clocks are shifting earlier, causing them to begin their breeding and migration cycles earlier in the year. This is a well-documented impact of climate change on bird populations around the world. The other choices (B, C, D, and E) are less likely explanations, as there is insufficient evidence to support them.

In the Eastern United States, 28 Species of Migratory Birds