| 1. Kidneys | A. Air |
| 2. Heart | B. Food |
| 3. Lungs | C. Blood |
| 4. Stomach | D. Wastes |
A) 1-A, 2-C, 2-D, 4-D
B) 1-D, 2-C, 3-A, 4-B
C) 1-C, 2-D, 3-B, 4-A
D) 1-D, 2-C, 3-B, 4-A
Correct Answer: B
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