What is a twin?

  • A
    Developed from the same zygote
  • B
    Developed from different zygotes
  • C
    Two different sperm
  • D
    Two different ova

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$R$: This involves cell movements (morphogenetic movement) that eventually help to attain new shape and morphology of embryo.

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Which of the following changes occur in the fetus after $24$ weeks of gestation?

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