All of the following are characteristics of urochordates,except:

The animal that possesses a notochord throughout its life is

In which of the following is the notochord extended from head to tail region and is persistent throughout their life?

The notochord in vertebrates is modified into

The notochord is .........

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: