Biology 9700 · AS & A Level · Cells as the basic units of living organisms

Cells as the basic units of living organisms — practice question

The graph illustrates the thickness of the walls of the main blood vessels carrying blood to and from a mammalian heart. Which blood vessel is the pulmonary artery?

  • Ablood vessel A
  • Bblood vessel B
  • Cblood vessel C
  • Dblood vessel D

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