Select the correct option for the $notochord$:

Which of the following is not a subphylum of Chordata?

Which of the following is not included in the phylum $Chordata$?

Select the correct statements with reference to chordates.
$A$. Presence of a mid-dorsal,solid and double nerve cord.
$B$. Presence of closed circulatory system.
$C$. Presence of paired pharyngeal gill slits.
$D$. Presence of dorsal heart.
$E$. Triploblastic pseudocoelomate animals.
Choose the correct answer from the options given below:

All of the following are characteristics of urochordates,except:

The statement that 'all chordates are metamerically segmented' is: