Which of the following respiratory organs are present in spiders and scorpions?

Which of the following modes of respiration always continues in a frog?

If a fish is taken out of water,it dies immediately because...

Match the Column $I$ with Column $II$.

Column $I$ (Animals)	Column $II$ (Respiratory organs / surface)
$1$. Spider	$a$. Internal gills
$2$. Coelenterates	$b$. Book lungs
$3$. Frog	$c$. Plasma membrane
$4$. Fishes	$d$. Lungs
	$e$. External gills

Choose the correct option.

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

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