Which of the following best illustrates "feedback" in development?

  • A
    Tissue $X$ secretes $RNA$ which changes the development of tissue $Y$.
  • B
    As tissue $X$ develops, it secretes enzymes that inhibit the development of tissue $Y$.
  • C
    As tissue $X$ develops, it secretes something that induces tissue $Y$ to develop.
  • D
    As tissue $X$ develops, it secretes something that slows down the growth of tissue $Y$.

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