Processes in the human body are often complex and can be difficult to represent with a physical model. Evaluate the model that Sammi designed by thinking about how her model compares to the actual interaction of the digestive and circulatory systems. Then, sort the statements according to whether they are strengths or weaknesses of her model. Not all statements will be used.

1. All the major organs involved in digestion are included.

2. The corrugated cardboard shows how villi increase the surface area of the digestive tract.

3. The process of nutrient absorption is depicted in a visual way.

4. Cardboard and the tissue of the digestive tract have different properties.

5. The capillaries are more complex than one, large plastic tube.

6. The major organs are responsible for circulating blood are included.

7. Only one system is included in the model.