Difficulty: Easy
Average Score: 100%
The starling, a bird species imported from Europe, competes with the native bluebird for food and nesting sites. In order to increase the number of nesting sites, an environmental group set up nesting boxes with holes small enough to exclude the starlings. Below is a graph showing the yearly effect of the special nesting boxes for bluebirds.

Which of these years had the biggest increase in nesting sites over the preceding year?

Diagram for question

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