How might cancer stem cells can lead to the reoccurrence of tumors

What is the difference between the conducting zone and the respiratory zone of the respiratory system? the conducting zone is a series of cavities and tubes that move air to the respiratory zone where gases exchange with the bloodstream. the conducting zone exchanges gases between the lungs and the alveoli and the respiratory zone is a series of cavities and tubes that move air to the conducting zone. the conducting zone moves oxygen into the cells and the respiratory zone takes carbon dioxide away from the cells. the conducting zone moves oxygen into the bloodstream and the respiratory zone takes carbon dioxide away from the bloodstream.

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Cells in organisms need food, air, and waste removal. how are these needs met? a. cells get their food from the air and sunlight around them. b. organs and tissues perform these functions for the cells. c. cells share their waste with other cells. d. each cell must specialize in all of these functions.