In which of the following animals, respiration occurs without any respiratory organ ?

In which of the following animal, respiration occurs without any respiratory organ ?

In which of the following animals,resiration occurs without any-repiratory organ?

Specialised respiratory organs are absent in or in ehich of the following respiration occurs without any repiratory organ

Anaerobic respiration occurs without

Respiration without a distinct respiratory organ occurs in

Respiration without a distinct respiratory organ occurs in

Respiration without a distinct respiratory organ occurs in

Respiration without a distinct respiratory organ occurs in