Which of the following is a Cephalochordate?

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

Which of the following phyla possess a post-anal tail at some stage of their life?

Which of the following distinguishes chordates from non-chordates?

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:

In $Urochordata$,the notochord is found in: