The animal group,where the adults are degenerated but larvae are well developed,is

$Herdmania$ belongs to which subphylum?

Which of the following animals is included in Urochordata?

The following are the statements about non-chordates:
$A$. Pharynx is perforated by gill slits.
$B$. Notochord is absent.
$C$. Central nervous system is dorsal.
$D$. Heart is dorsal if present.
$E$. Post anal tail is absent.
Choose the most appropriate answer from the options given below:

Which of the following possesses an endoskeleton made of cartilage or bone?

Write the characteristics of animals that possess a notochord throughout their life.