Which of the following characteristics is $NOT$ applicable to both Urochordata and Cephalochordata?

Which of the following is a group of invertebrate chordates?

The group $Amniota$ includes:

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:

Apart from Annelida and Arthropoda,metamerism is also exhibited by ............ .

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