Neural crest cells break off from the ________ and later move to the sides of the developing embryo to form  ________

$A$ : All copulations do not lead to fertilisation and pregnancy.
$R$ : Fertilisation can occur if the ovum and sperms are transported simultaneously to the ampullary-isthmic junction

Each seminiferous tubule is lined on its inside by two types of cells $A$ and $B$. Which of the following options is correct, w.r.t. the type of cell and its function?

Which of the following cannot pass through the placenta into the foetus

Bartholin’ s glands are situated