The longer, warmer days of spring spark phenological changes in trees, from root to tip. As the limbs of trees stretch and ...

The longer, warmer days of spring spark phenological changes in trees, from root to tip. As their limbs stretch and twist ...

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With the exception of "Editorial use only" photos (which can only be used in editorial projects and can't be modified), the possibilities are limitless. Learn more about royalty-free images or view ...