Which of the following systems provides the fastest means of communication within the body?

  • A
    Reproductive system
  • B
    Nervous system
  • C
    Circulatory system
  • D
    Digestive system

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The nervous system in vertebrates develops from which of the following germ layers?

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If a child of $10$ years has the intelligence of a $14$ years old child,the $I.Q.$ of this child would be:

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