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charle [14.2K]
2 years ago
5

This graph shows that bird ranges in the winter have been shifting northward over several decades

Biology
2 answers:
horsena [70]2 years ago
7 0
The first box is migration
The second box is the northern regions have become warmer because of climate change 
german2 years ago
5 0

Answer:

The first box is migration

The second box is the northern regions have become warmer because of climate change

Explanation:

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