In the sub-phylum (_i_) notochord is present only in the larval tail, while in (_ii_),
Channel: Doubtnut
Date: 29/03/2020

In the sub-phylum (_i_) notochord is present only in the larval tail, while in (_ii_), it extends from head to tail region and is persistent throughout their life. In (_iii_) class of vertebrate notochord is replaced by certilaginous vertebral column and (_iv_) class of vertebrate the notochord is replaced by bony vertebral column. select the option which is correct for all (i)-(iv) blanks.