What are the two gasses exchanged in the lungs?
A. oxygen and nitrogen
B. nitrogen and carbon dioxide
C. carbon dioxide and magnesium
D. oxygen and carbon dioxide
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Other quiz: Cells
Which best describes the main job of most cells in multicellular organisms?
A. Cells work to keep themselves alive.
B. Cells work to keep the organism alive.
C. Cells work to release needed materials.
D. Cells work to store unneeded materials.