Excretion, in unicellular plants and animals, takes place through _________.
  • Diffusion
  • Osmosis
Which organ system removes cellular wastes as the result of cellular respiration?
  • nervous
  • digestive
  • excretory
  • circulatory
what do the lungs do in the excretory system
  • dispose of carbon dioxide through exhalation
  • disposes of smog thru exhalation
  • dispose of ultraviolet rays through exhalation
  • dispose of rays through exhalation
What vascular tissue transports food within a plant?
  • Phloem
  • Xylem
  • Stomata
  • Cell wall
What vascular tissue transports water within a plant?
  • Phloem
  • Xylem
  • Stomata
  • Cell wall
_______ are tubes that carry nutrients to other parts of the plant. 
  • stomata 
  • roots 
  • xylem 
  • xylophone 
What is the main function of the excretory system?
  • to collect and remove wastes from the body
  • to strengthen skeletal muscles
  • to protect the nervous system
  • to bring oxygen to body cells
The process of removal of the body’s wastes is called
  • gas exchange.
  • respiration.
  • excretion.
  • filtration.
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