This no prep lesson answers the question "What makes something living?" A 12 slide PowerPoint guides students through the characteristics of living things and the cell theory to help them understand how scientists define life. Worksheets ask students to sort, answer questions, and respond to writing prompts to help them deepen and solidify their understanding of concepts. Guided notes – both PDF and editable word documentPowerPoint – corresponds with the notes. Most text is editable, images are