Urochordata: All the members of this subphylum are:

The group $Amniota$ includes:

Which of the following statements is $NOT$ true for invertebrates?

Which of the following animals possesses a notochord throughout its entire life?

Identify the animals belonging to Urochordata (Tunicata) and Cephalochordata,respectively.
Urochordata $\quad$ Cephalochordata

Assertion $(A)$: $Ascidia$ and $Salpa$ are placed under sub-phylum $Urochordata$.
Reason $(R)$: In $Ascidia$ and $Salpa$,notochord is present only in larval tail.
In the light of the above statements,choose the most appropriate answer from the options given below: