Plant or animal? As part of the Houghton Mifflin Harcourt thematic unit Our Earth, learners engage in activities and exercises that provide them with extra support to master the concepts in the unit.

By studying the once-assumed extinction, then rediscovery of the Ivory-Billed Woodpecker, learners look at the physical changes that have occured in habitats throughout Arkansas. This outstanding lesson is chock full of terrific...