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![Hard-to-Teach Biology Concepts: Designing Instruction Aligned to the NGSS: Revised 2nd Edition: Designing Instruction Aligned to the NGSS [Hardcover]](/itemImage/2/4/7/0/2_7225071.jpg "Hard-to-Teach Biology Concepts: Designing Instruction Aligned to the NGSS: Revised 2nd Edition: Designing Instruction Aligned to the NGSS [Hardcover]")