labyrinthodontians are
the amphibians which have no tail are called as
classification of amphibians has been given by
sauropsidans are
Ichthyopsidans are
The study of birds is called as
The most primitive bird is Archeopterix which was found in a slate quarry in
The vertebrate which has first invaded land is _____ and th efirst to have a successful life on land is _________ respectively
amniotes are
Notochord is made of
The largest enterocoelomate phylum is
chorda dorsalis is also called as
In higher vertebrates the notochord is absent in adult stages and is seen in the embryonic stage except in
nerve cord in chordates is derived from
in chordates internal segmentation is evident only from the presence of
creatine phosphate is a
In chordates the hepatic portal vein starts from the
connecting link between the invertebrates and chordates is
urochordate ancestry was explained by
Hyman concluded that echinoderms , Pterobranchs , hemichordates , and chordates might have a common ancestor probably because all have
when somatic features grow at a slow rate than those that grow in their ancestor s is referred as
Test or covering of the urochordate is made of
blood pigment of urochordate contain
alternation of generationis exhibited by some members of the urochordates like
strongest light emmiter is
During the retrogressive metamorphosis the larva loses the following features
The following are the characters of urochordates
The process by which the organisms retain the larval characters and attains the adult characters is called as
excretory organs of cephalochordates is
In vertebrates the brain is covered by