All vertebrates are chordates but all chordates are not vertebrates, why?
(1) All chordates possess notochord throughout their life.
(2) Notochord is replaced by vertebral column in adult of some chordates
(3) Ventral hollow nerve cord remains throughout life in some chordates.
(4) All chordates possess vertebral column.
(1) All chordates possess notochord throughout their life.
(2) Notochord is replaced by vertebral column in adult of some chordates
(3) Ventral hollow nerve cord remains throughout life in some chordates.
(4) All chordates possess vertebral column.