Human Body Skill Builder
| # | Answer |
|---|---|
| 1 | Examples include water, oxygen, carbon dioxide, calcium, iron, and proteins. Any two correct examples are acceptable. |
| 2 | Blood picks up oxygen in the lungs and carries carbon dioxide away from the cells. |
| 3 | Minerals help build strong bones and teeth. They also help the body work properly. |
| 4 | Chemistry helps break food into smaller molecules during digestion. These molecules are absorbed into the blood and used by cells to release energy for body activities. |
| 5 | A strong answer will explain that the body has many chemical processes, such as digestion, breathing, and using nutrients in cells. For example, enzymes help break down food, oxygen and carbon dioxide are exchanged in breathing, and minerals help build bones. Answers may vary if they give two correct chemistry-based reasons. |