A student made a model of a lung using a straw, some
modeling clay, and a glass bottle. First the student inserted
the straw into the opening of the bottle. Then the student
sealed the connection by pressing modeling clay around
the straw at the bottle's opening.
One limitation of the model is that it does not represent how a
lung can expand and contract as it fills with air. Which way of
refining the model would best address this limitation?
A. Using a flexible straw that bends instead of a rigid straw
B. Filling the bottle with small glass beads instead of air
c. Using a flexible container such as a balloon instead of
the glass bottle
D. Using glue instead of modeling clay to seal the opening
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