NCES.5.L.1 - Understand how structures and systems of organisms (to include the human body) perform functions necessary for life.
- NCES.5.L.1.1 - Explain why some organisms are capable of surviving as a single cell while others require many cells that are specialized to survive.
- NCES.5.L.1.2 - Compare the major systems of the human body (digestive, respiratory, circulatory, muscular, skeletal, and cardiovascular) in terms of their functions necessary for life.