Fill in the blanks `:` (i) Four characters of Chordates are the presence of `"…......."` dorsal hollow nervous system, `"…................."` and muscular tail. (ii) Urochordates are marine, sessile, `"….................."` feeding invertebrate chordates. Common example is `".................."` (iii) Agnatha are the most primitive Craniates. They are commonly called `"................"` vertebrates. (iv) Electric ray belongs to class `"..................."` while sea horse belongs to class`".................."` (v) A lizard - like reptile `".............."` of New Zealand is a living fossil. (vi) Snakes and lizards belong to class `"..............."` while frogs and toads are included in class`"................."` (viii) `".................."` are also defined as feathered dipeds. These have a lone `"................."` gland on the tail.

Fill in the blanks `:` (i) Four characters of Chordates are the presen

1.	Fill in the blanks `:` (i) Four characters of Chordates are the presence of `"…......."` dorsal hollow nervous system, `"…................."` and muscular tail. (ii) Urochordates are marine, sessile, `"….................."` feeding invertebrate chordates. Common example is `".................."` (iii) Agnatha are the most primitive Craniates. They are commonly called `"................"` vertebrates. (iv) Electric ray belongs to class `"..................."` while sea horse belongs to class`".................."` (v) A lizard - like reptile `".............."` of New Zealand is a living fossil. (vi) Snakes and lizards belong to class `"..............."` while frogs and toads are included in class`"................."` (viii) `".................."` are also defined as feathered dipeds. These have a lone `"................."` gland on the tail.
Answer» (i) notochord, pharyngeal slits (ii) filter, Herdmania ( the sea squirt ) (iii) Jawless (iv) Chondrichthyes, Osteichthyres (v) Spehnodon ( the tuatara) (vi) Reptilia, Amphibia (vii) Birds , uropygial ( preen or oil ) .