One of the following is a very unique feature of the mammalian body –

Bioluminescence is exhibited by

In which animal nerve cell is present but brain is absent ?

In which of the following notochord is present in embryonic stage ?

In which of the following animal post anal tail is found ?

Polyp phase is absent in

Which of the following character is not found in all the chordates ?

What is the true for mammalia ?

Similarity between fish and tadpole is

Which one of the following has an open circulatory system ?