Branchiostoma belongs to

Which of the following cannot be considered a characteristic of non-chordates?

$A$ rod-like structure formed on the dorsal side during embryonic development in some animals, which is mesodermally derived:

$A$: All chordates have kidneys as excretory organs.
$R$: Kidneys help in the removal of metabolic wastes along with regulating the osmolarity of body fluids.

Which one of the following features is found in chordates but not in non-chordates?

Which of the following is the smallest taxonomic group of animals having a cranium,vertebral column,ventral heart,pulmonary respiration,and two pairs of limbs?