The cell theory is highlighted, including the important discoveries that led to its development. Common cell parts are illustrated through lifelike animations, as are different types of cells, including prokaryotic and eukaryotic cells. Explores essential cell activities, such as energy conversion and reproduction. Concepts and terminology include: building blocks of life, animal cell, cell membrane, nucleus, cytoplasm, plant cell, photosynthesis, cell wall, chloroplasts, organelles, and role of cells in the body. .