A student builds a model of the heart and lungs, shown in the diagram. Two trucks, 1 and 2, travel between the organs. The student will label the trucks with what they are carrying. Which set of labels BEST completes the model?
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4 points
Captionless Image
Truck 1 carries carbon dioxide and Truck 2 carries oxygen.
Truck 1 carries white blood cells and Truck 2 carries red blood cells.
Truck 1 carries oxygen and Truck 2 carries carbon dioxide.
Truck 1 carries red blood cells and Truck 2 carries white blood cells.