This model can be put together to show the pumping of the human heart. Directions are enclosed and all pieces are accounted for although the box has some wear and tear. It has only been used once and parts were painted according to the directions.
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I have taught elementary school for 17 years. Most of these years have been in third grade. I currently teach third grade with an above-level Language Arts class (3rd grade students working at a fourth grade level).