The document discusses how cells work and describes an activity where students will learn about organelles in cells and their functions. It introduces the idea that cells can be thought of as miniature cities, where organelles represent different parts of a city that each have specific jobs, like companies or locations. Students will use resources to learn about plant and animal cell organelles and fill out a chart about their locations and functions. They will then complete an assessment activity creating analogies between organelles and parts of a large city.