For gaseous exchange,plants have:

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

The respiratory organs vary in different animals due to their

In insects,respiratory gas exchange occurs through

Which of the following does not have a specific respiratory organ,yet performs the process of respiration?

In crustaceans,respiration occurs through ..........