Which of the following animals is included in Urochordata?

Which of the following statements are true for the phylum $Chordata$?
$(a)$ In $Urochordata$,the notochord extends from head to tail and is present throughout their life.
$(b)$ In $Vertebrata$,the notochord is present during the embryonic period only.
$(c)$ The central nervous system is dorsal and hollow.
$(d)$ $Chordata$ is divided into $3$ subphyla: $Hemichordata$,$Tunicata$,and $Cephalochordata$.

Which one of the following is not a characteristic feature of all the chordates?

Which of the following cannot be considered a characteristic of non-chordates?

Usually,chordates have red blood containing red blood corpuscles. The blood is red due to the presence of the following pigment:

The animal that possesses a notochord throughout its life is