Blood flowing in the umbilical cord of a mammalian embryo is:

  • A
    $100\;\%$ maternal
  • B
    $50\;\%$ maternal and $50\;\%$ foetal
  • C
    $100\;\%$ foetal
  • D
    $75\;\%$ foetal and $25\;\%$ maternal

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Match the following:
Column-$I$ Column-$II$
$A$. $1^{st}$ month $i$. First movement of foetus
$B$. $2^{nd}$ month $ii$. Major organ system
$C$. $3^{rd}$ month $iii$. Foetal heart
$D$. $5^{th}$ month $iv$. Limbs $\&$ digits

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