| Investigation 5.0Introduction | Think back to the beginning of this unit when your teacher had you exercise. | | What did your body need in order to do that activity? | | What does it need to perform any of the regular activities every day? | |
| You have seen in previous lessons that the smallest units of structure in the body are cells and that cells from different tissue often look and function differently. But they all need energy to carry out their assigned tasks. | |
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