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The idea that all cells share a common ancestry is supported most strongly by

  • A.the presence of walls in most cells
  • B.the fact that all cells contain water
  • C.the universality of the genetic code
  • D.the similar sizes of all known cells

Answer: C

Almost every organism reads the same codons as the same amino acids, which would be an extraordinary coincidence had life arisen more than once independently. Size, walls and water content are far weaker evidence, since each varies widely among cells.

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