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america american amount angle animal animals author blood capital cause cells change character children circle class country define definition describes difference earth energy equation examples family force formed government health heart house human identify indicate information language length letter light lines little living major matter measure metaphor money mother north object ocean paragraph passage people person personification plant plants player president process purpose question school sentence sentences simile solve sound south space spelled spelling statement story students study subject surface system takes temperature times united value water world
140 questions match "ecosystem" across multiple grade levels.
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