In the adult phase of a frog,which of the following characters becomes degenerate?

$A$ fully grown tadpole larva of a frog respires through:

In which of the following is $Bidder's$ canal present?

The fifth cleavage of the fertilized egg of a frog results in the formation of: (in $cells$)

During embryonic development,the establishment of polarity such as anterior/posterior,dorsal/ventral,and medial/lateral axes is called:

What type of cleavage occurs in a mesolecithal egg?