By Rebecca L. Johnson
Cells: Life’s Building Blocks guides students as they discover that all living things are made of cells. After reading about the history and significance of the discovery of cells, students learn about the two main classifications of cells—prokaryotic cells and eukaryotic cells. Students also learn about the function of different cell organelles and the process of cell division. Students read about multicellular organisms and the hierarchy of organization from cells to tissues to organs to body systems. At the end of each two-page spread, a brief statement called The Bottom Line reinforces students’ understanding by summing up the key ideas about cells covered in those pages.