Aves exhibit following characteristics except?

First true terrestrial vertebrate animal is.

Respiration in tadpole of a frog is performed by

Animals belongs to class cyclostomata

Cranium encloses ___________ in case of vertebrates

Notochord is replaced by vertebral column in case of

Body is covered by test or tunic in

In chordates heart & brain is present on

_________ is considered as a connecting link between chordates & non-chordates

In saccoglossus Notochord is present in

Animals of this phylum exhibit triploblastic organisation is/are?

Aurelia exhibit ___________ symmetry

Identify the odd man out.

__________ is the parasitic worm which can be found in eyes