Different types of respiratory organs like gills,book gills,book lungs and trachea are present in

Which group of animals respire through lungs?

Which of the following pairs correctly represent an animal and its respiratory organ?
$(a)$ Silverfish $-$ Trachea
$(b)$ Scorpion $-$ Book lungs
$(c)$ Sea squirt $-$ Pharyngeal gills
$(d)$ Dolphin $-$ Skin

Amphibians respire through ........

$A$ hatching egg of a chick is covered by plaster of paris. It is harmful for

In insects,oxygen is transported to various tissues by ...........