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Apoptosis triggered by the absence of survival signals shows that many cells

  • A.are entirely immune to any external signalling
  • B.can survive indefinitely without any input at all
  • C.depend on continual signalling to stay alive
  • D.die only when they are actively instructed to do so

Answer: C

The default state for such cells is death, which is prevented only while the signals continue. This arrangement helps ensure cells survive only where they are wanted. Cells that stray from their proper tissue are removed by default.

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